Very cool games, simple and addictive, for the fans of Tetris and such. My personal favorites would be MyHouseIsBiggerThanYourHouse and Save the Shoppers.
Plus, the .swf and the source .fla can downloaded for free!
http://www.tonypa.pri.ee/english.html

Really easy-to-use PHP script to display RSS or Atom feed as pure HTML code on website.
http://www.geckotribe.com/rss/carp/

(Perhaps) the largest digital panoramic photo in the world. 2.5 billion pixels. If this photo were printed, it would measure 6.67 m by 2.67 m (300 dpi).
http://www.tpd.tno.nl/smartsite966.html

Place items and headlines from any RSS or Atom enabled site (or del.icio.us) onto your site, no programming required. It can use either JavaScript, PHP, or an IFRAME as the inclusion method. Get no ugly ads, and use ANY feed.
http://www.bigbold.com/rssdigest/index.html

Stupid linking policies from (stupid) websites…
http://www.dontlink.com

Portable Firefox is a fully functional package of Firefox optimized for use on a USB key drive. It has some specially-selected optimizations to make it perform faster and extend the life of your USB key as well as a specialized launcher that will allow most of your favorite extensions to work as you switch computers. It will also work from a CDRW drive (in packet mode), ZIP drives, external hard drives, some MP3 players, flash RAM cards and more.
http://portablefirefox.mozdev.org

10 X 10= 100 pictures, illustrating 100 words.
Every hour a new picture and a new word, “defining the time”.
http://www.tenbyten.org/10×10.html

Cross-platform media player and streaming server, VLC (initially VideoLAN Client) is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.
Thanks Jul
http://videolan.org/vlc

“Grand Theftendo is a new homebrew game for the original Nintendo Entertainment System (NES).
It is a tribute to Rockstar Games’ Grand Theft Auto III running on the 8 bit, 256×240 resolution, 2 bit colour x 2 bit palette, 1.79 Mhz system, written entirely in 6502 Assembly Language!”
http://www.grandtheftendo.com

And PSOnes for that matter…
Sony Computer Entertainment has released its updated sales figures for hardware on a global basis, revealing statistics as staggering as they are unsurprising.
http://news.spong.com/x?art=7902

Not the official site for the project but links for the sound itself to avoid you the pain to read arty bullshit. Anyway 9 Beet Strecth is an art perfomance which consist of stretching the 9th symphony of Beethoven to a 24 hours long piece.
It’s done via granular synthesis which doesn’t affect the pitch so basically it sounds exactlly the same but it spans over 24 hours. Much more ear blowing than the last Prodigy, believe me.
http://mrtg.planetmirror.com/pub/9beetstretch

“This hack (NOT plugin) displays an image with some random text that the commenter has to enter in order for their comment to go through. This should cut down on any bots out there from spamming your comments area and perhaps remove the need for comment moderation.”
http://www.gudlyf.com/index.php?p=376

“I’ve made my first plugin for WordPress. When activated, this plugin will send an email to people who comment (and supply a valid email address) with a unique link. Clicking on the link will approve the comment for immediate posting, without waiting for an administrator’s approval.”
http://www.skippy.net/blog/2004/04/27/plugin-comment-authorization