Other links:

1. American Mathematical Society (AMS)
2. Kedlaya's Math Competitions Archive (but see also the American Mathematical Monthly for different solutions to the Putnam exam)
3. Electronic Journal of Combinatorics, World Combinatorics Exchange
4. SIAM Journals (subscription only)
5. Tree of Life (a catalog of lifeforms)
6. dejanews newsgroup searcher
7. Preprint servers: AMS
8. Zip code lookup
9. Online cameras: Focus Camera and Video
10. Online coffee: Torrefazione Italia, Peets
11. Books in print by particular publishers: Oxford University Press (try also *), Prentice Hall, McGraw-Hill, list of others
12. NSF: Division of Mathematical Sciences, forms, grant proposal guide (HTML version is here), award search, Research Experience for Undergraduates
13. UNL Research Council
14. WWW Searchers: excite, WebCrawler, WWW Worm
15. Some FCC Rules about telephone solicitation are here.
16. United States Senate
17. A tiny bit of food/cooking related stuff is here.
18. The 3n+1 problem -- a cool java demo.
19. Where to go to track IP numbers of hackers.