Rating: 
Summary: Super Memory
Review: I got this for my Canon Powershot s30 and boy was I impress with the amount of images I can take. This baby has more memory than my PC! It's great and its worth every single penny. I highly recommend this to anyone who needs to expand their existing internal memory. Viking is a very reliable brand. I also have Viking 128mb SmartMedia for my iRock MP3 player.
Rating:
Summary: Great and cheap
Review: I'm taking photos like crazy with my G2, and needed a lot of space, with the 256 Viking, I could go anywhere with confidence. It performs fast too. I recommend it.
Rating:
Summary: Works as advertised
Review: No problems. It's kind of like a coffee mug, it just works...
Rating:
Summary: One of the fastest / cheapest cards you'll find!
Review: How can you resist a card that's rated at 15X speeds and has a whopping 256MB of memory? Worked perfect in my Canon S230 (I previously had some generic card from Fry's Electronics and i had to return it since it sucked so bad).
Rating:
Summary: excellent price/value ratio for 4 megapixel cameras
Review: Nobody would argue that the more memory you have in your digital camera, the better. The question is what the reasonable compromise between the price of a memory card and its size is, and how to predict how much memory you actually need before you paid for it. I looked up some literature on the image compression techniques, and made some experiments with printing out pictures with different resolution and different compression ratios, and came to the following conclusions.
Most cameras offer a choice between several picture resolutions and several image compression modes. Low resolution is good for on-screen viewing, while high resolution is better suited for printouts. Additionally, one can choose between several compression modes. Higher resolution settings combined with the weakest compression result in better pictures at the expense of larger file sizes. The problem is that all digital cameras ship with very small memory cards - 8MB, 16 MB, sometimes 32 MB, and this is just not enough even for a day of shooting. I think most people would be happy to have a storage space for at least a couple of hundreds of puctures, equivalent to 8-9 rolls of film. In my experience, this is what you can expect to get from a 256 MB card if you use a 4 megapixel camera and medium compression. A few comments are in order to help you to understand better what resolution and compression mean in terms of the file size. 1. Resolution. The huge resolution numbers of ink-jet printers may be confusing, for instance, 1440 dots-per-inch (dpi) resolution may make you think that a 2000x2000 pixel image would print well only in the size of about 1.5x1.5 inches. This is absolutely wrong since resolution of the printer reflects primarily the minimum size of the ink dot which the printer can create, but not necessarily the size of a meaningful pixel of the image. In fact, printer manufacturers suggest that for the best results the resolution of the image should be 1/3 to 1/4 of the maximum printer resolution. Hence, expect that your final output will be printed with 250-300 dpi resolution. A four megapixel image will then print with a perfect quality up to the size of 8x10 inches. Smaller pictures, such as 4x6 inches, require a lot less pixels - 2 megapixels is sufficient! However, since you never know when you will need to print that one perfect picture in a larger size, I would suggest that you shoul always use the highest pixel resolution of your camera. Additionally, it gives you better flexibility in terms of cropping the image later on. 2. Compression. Unfortunately, high resolution images require lots of storage space: a 4-megapixel uncompressed image can be as large as 12 MB. JPEG compression, which is based on an algorithm specifically developed for image compressing helps to store large pictures in relatively small files. Specifically, JPEG compression algorithm divides an image into squares 8*8 pixels each, performes two-dimensional discrete cosine trasform of each of these squares, and compresses their frequency spectra by removing high-frequency components or by decreasing their accuracy through a "quantization" procedure. While this review is not appropriate for a discussion of technical details of the JPEG algorithm, it is worth saying that JPEG analyzes each small "brick" of the image individually and adapts the level of smoothing/compressing to the image to be compressed. In fact, when you choose the compression mode, you determine not the size of the compressed image, but its quality in the compressed form. Therefore, the final size of the compressed file may vary by as much as 2 to 3 times depending on each particular image. This is why you can never know for sure how many pictures will fit on your memory card, you can only have a rough estimate. The "adaptive" nature of JPEG makes it very efficient: it takes advantage of the smoothness of monotonically colored parts of the image by achieving great compression ratios in those areas without significant losses in quality, and it is also good at rendering sharp contrasts in the image. Since JPEG standard was optimized to take into account the specifics of our perception of visual information (like mp3 compression of music files takes advantage of the way how we hear music), JPEG compressed pictures are almost undistinguishable from the originals up to the compression ratios of 1:8 to 1:12. In my experience, medium compression works well almost always, with the exception of the case when you take a picture with lots of details, bright spots, contrast objects, etc., and want to print in 8x10 size. Then you should use the weakest compression ("fine"), or no compression at all. I have a Canon Powershot S40 and used it with highest resolution and medium compression. The size of the file varied from 500 kB to 1.8 MB from picture to picture. The average size (calculated using 800+ pictures) was 840 kB. Hence, I could fit 200-300 pictures on this 256 MB card. The last comment: note that there are three types of memory, flash, SmartMedia, and Sony memory stick. Check you camera manual which one you need, they are not interchangeable.
Rating:
Summary: GREAT RELIABLE PRODUCT
Review: 1. format your new disk when you get it
2. test it in your camera (take a couple photos and then put them onto your computer.)
3. sometimes cameras fail the image, not the cp flash card
4. I have had no problems with my card for over 6 months and I take more than 400 photos a week
5. NEVER buy a 500mb card or more unless you are prepared to lose all your photos. I do not recommend any higher mb cards than 256mb. If your card ever fails you, reformat it. You can always email the company. Big companies are awesome, they give new products, refunds, and take care of you. That is how they got to be big companies.
Rating: 
Summary: Am I just unlucky?
Review: I bought this viking256M cf card before the Christmas for my
SF vacation. I have been using a Scandisk 256M with my Canon G2
for half year.Buy this card as backup.
We took about 600 pictures.We don't have any problem with the
Scandisk card which holds 400 pics.But THIS Viking card sucks!
First there are 3 or 4 pics which are "corrupted",I had to
delete them to download the others.Then,There are 2 other with
error in card, which messed with the G2 software and caused
18 pics.....
I always read reviews before I buy anything online.Viking card
seems get pretty good reviews here in Amazon.It is unfair to
say the brand is "bad" just because of one time experience.
But,it is enough for me.
Rating:
Summary: Just insert it & you are all set.
Review: Just open the case & put it into Canon S30 digital camera & all set. We are taking picture like anything with this 256MB card. Must for someone who has digital camera.. buy it..
Rating:
Summary: Fast!
Review: This CF card works twice as fast as my old Sandisk card in my Nikon CP995
Rating:
Summary: Lots of bang for your buck
Review: If you've wanted a gigantic capacity for your digital camera, this is a great value. Mine has worked flawlessly and hold more photos than I can shoot. I highly recommend this.
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