software

http://www.xmarks.com/ Foxmarks is a Firefox plugin which lets you automatically sync/backup/mirror bookmarks across machines. I use them as backup for the LotD archives and queue.

http://www.potionfactory.com/blog/2006/10/19/introducing-tangerine/ Tangerine analyzes the songs in iTunes to find their BPM and tries to make playlists of songs that go together energywise.

http://www.villagevoice.com/2006-10-10/news/planespotting/ A very interesting article about planespotters, people who track arrivals and departures of planes, and how a group of planespotters used the Internet to discover the CIA's system of secret prisons.

http://getsongbird.com/ Songbird is a free, open source MP3 and media player for MacOS X, Windows, and Linux.
http://blog.fortiusone.com/2006/10/11/heat-maps-for-google-maps-aka-geoiq-mashup/ A story about implementing traffic information in a Google map.

http://wheelof.com/whitney/index.php?var=v14 The Whitney music box, a hypnotic flash program. Be sure to see the other music boxes linked on the left.
http://www.openttd.org/en/ Open source implementation of the Traffic Tycoon game. It requires the original game in order to play although they are writing replacement code so everyone can use it.

http://openmosix.sourceforge.net/ OpenMosix is a set of patches to the Linux kernel which combine a network of machines into a single supercomputer.

http://www.dirtycarart.com/DCAGallery/ Pictures drawn in the dust of dirty cars.
http://osxbook.com/book/bonus/chapter5/panic/ Instructions on how to change the kernel's kernel panic error message screen to any picture you want, even the BSOD.
http://www.photomann.com/japan/machines/index.htm Pictures of different Japanese vending machines.

http://windowsupdate.microsoft.com/ The most important website on the Internet. Don't go there if you've got a stolen version of Windows, however.

http://www.google.com/search?hl=en&lr=&safe=off&q=confidential+%22do+not+distribute%22&btnG=Search Whoops, don't publish your confidential documents online where Google can see them.

http://www.youtube.com/watch?v=94KzmB2bI7s Cool experiment that uses speakers to lift things.
http://ransom.redjar.org/ All of the USGS topographical maps were bought by this guy and were sent over to the Internet Archive so soon you shall be able to download them for free. Check back for updates. This is cool.
http://mcmcweb.er.usgs.gov/drc/dlgv32pro/ USGS mapviewing software.