A Pocket Style Manual/Online!: With 2003 MLA updates

Rating:
Summary: Excellent! A bargain at twice the price!
Review: If you are new to the Internet, then this is your book

Rating:
Summary: Helps Bridge the Gap from Print to Web-based Research
Review: Properly documenting one's sources is crucial for any serious researcher in any endeavor. Such documentation establishes credibility for the researcher and helps cross-pollinate additional research when properly cited in a thorough bibliography.

Online!: A Reference Guide to Using Internet Sources is an upbeat, easy to follow reference that shows how to document and cite one's research on the Internet. Moreover, this much-needed book shows how to cite entries in the styles set forth by the Chicago Manual of Style, the MLA Handbook, the CBE manual, and the APA publication manual.

That cross-referencing alone is worth the modest cost in my opinion.