Cool sites include Timecast: The RealAudio Guide, Anonymizer Privary Analysis, and EarthCam. I hate email abuse so I looked into Join the Fight Against Spam!, and other items such as collected at Yahoo's junk email list and when I lived in WA state I was glad they had a junk-email law. I paid Spam Cop to filter out over a couple hundred spams/day and used it to report many to places like firstname.lastname@example.org - I also automatically forwarded junk received at around three dozen "spamtrap" style addresses to email@example.com for automated testing. Now I forward all my email to Gmail which has a Spam folder which works well (I can easily review it for rare false positives).
More useful sites include Deja News - The Source for Internet Newsgroups, InReference (similar to Deja News but allows ongoing notification), The URL-minder Your Own Personal Web Robot, RES-Links Finding People-Organizations-Hosts, My Virtual Reference Desk, Electric Library and: