Useful

http://www.futureme.org/ - Send your self or sombody you know an e-mail from the past.
http://www.phonespell.org/ See what cool words your phone number spells.
http://www.oldversion.com/ - Get outdated programs.
http://typera.tk/ - Find out how many words per minute you type.
http://www.worqx.com/ - Everything about color.
http://www.archive.org/web/web.php - Find older versions of websites.

Weird

http://www.purple.com/
http://www.zombo.com/
http://thispagecannotbedisplayed.com/
http://www.asdf.com/
http://stunned.net/scott/
http://www.robotfrank.com/
http://www.spatch.net/cattown/

Recently Bookmarked

All my boookmarks are publicly available at (Del.icio.us)