http://en.wikipedia.org/wiki/Menger_sponge Menger sponges for the uninformed.
http://www.theiff.org/oexhibits/menger02.html A Menger sponge made of business cards.
http://www.lswilson.ca/warstories.htm Stories from veterans of DEW Line outposts, Cold War radar stations in the far north of Canada.

http://tech.mit.edu/V126/N64/64largenumber.html Two professors have a duel to find the largest number.
http://phet.colorado.edu/simulations/ Online physics demos!

http://blag.xkcd.com/2007/01/29/washingtons-farewell-address-translated-into-the-vernacular/ The URL says it: Washington's Farewell Address translated into the vernacular.
http://www.gellibaff.co.uk/ Powder to turn your bathtub into slime!

http://chickencrap.com/specials/arctic.htm Shots of a partially melted then refrozen glacier which looks like a tidal wave of ice.
http://burn-osx.sourceforge.net/Pages/English/home.html An open source CD and DVD burning application for MacOS X.

http://filmcow.com/charlietheunicorn.html Charlie the Unicorn in WIDESCREEN. Be sure to check this one out.

http://en.wikipedia.org/wiki/Hikikomori Hikikomori is a recent Japanese phenomenon where teens and young adults completely shelter themselves from the outside world and live with their parents.
http://midnightsnacks.8chan.net/ Midnight Snacks is a podcast by W.T. Snacks which plays electronic music of all genres.
http://www.meriweather.com/777/deck-777.html Learn what everything is on the flight deck of a 777.

http://tanasinn.web.infoseek.co.jp/ Click on the first few letters of the "tanasinn" spiral in the middle to discover Tanasinn.
http://en.wikipedia.org/wiki/Aokigahara Aokigahara is the national park and forest below Mt. Fuji.
http://www.youtube.com/watch?v=0dEfYODztF0 Another wedding dance!

http://www.youtube.com/watch?v=OPmYbP0F4Zw Video from a wedding of the entire wedding party doing the Thriller dance. Be sure to view this one.
http://www.smithappens.com/picture/542/Leds-and-resistors-circuit-sex-positions.html Sex positions illustrated by resistors and LEDs. Safe for work

http://www.flickr.com/photos/stuckincustoms/310074290 HDR time-lapse photo of Bangkok from a tall tower. Very cool.
http://myfairlady04.blogspot.com/2007/01/my-computer-man.html This guy proposed to his girlfriend using Dashboard widgets in MacOS X.

http://www.bestrestroom.com/ The search for America's Best Restroom!
http://www.msnbc.msn.com/id/6847721/ A 17 pound baby in Brazil.
http://www.workrave.org/welcome/ An open source application that keeps track of your typing habits and forces you to break to prevent RSI.