Merriam-Webster has compiled a list of the most researched words on its Web sites, and this is the result:
1. blog
2. incumbent
3. electoral
4. insurgent
5. hurricane
6. cicada
7. peloton
8. partisan
9. sovereignty
10. defenestration
Blog will be a new entry in the 2005 version of the Merriam-Webster Collegiate Dictionary, with the following definition:

Blog noun

[short for Weblog] (1999) : a Web site that contains an online personal journal with reflections, comments, and often hyperlinks provided by the writer.

(Originally spotted on www.myboyfriendisatwat.com)