http://en.wikipedia.org/wiki/Parallel_Postulate The parallel postulate says that if two angles are parallel to each other (or if they interset a 3rd line at the same angle) they will never interset and is part of the proof behind a lot of geometery.
http://www.youtube.com/watch?v=lmA9yb7_JVI A 1000+ man game of Capture the Flag in Toronto.

http://en.wikipedia.org/wiki/Jerk_(physics) Jerk is the rate of change of acceleration.
http://www.churchhopping.com/ten-verses-never-preached-on/ Ten strange Biblical verses.

http://supersafe.ytmnd.com/ Crazy pictures from the manual from the Nintendo Wii.
http://en.wikipedia.org/wiki/Lee_County,_Virginia Lee County is the little county at the far tip of Virginia.

http://www.librarything.com/unsuggester/ The Unsuggester takes a database of "other people who purchased this book have also purchased" data and looks for a book that people who bought that one haven't bought.
http://en.wikipedia.org/wiki/Hans-Adam_II,_Prince_of_Liechtenstein Meet Hanz-Adam II, the Prince of Liechtenstein.

http://fishki.net/comment.php?id=15616 A photo gallery of amazing sand sculptures.
http://postrapturepost.com/index.html Write a letter to your agnostic and atheist friends, and then when the rapture happens this guy will mail them.

http://en.wikipedia.org/wiki/Rat_king Rat kings are plague rats which grow into a giant rat joined at the tail.

http://www.flashninjaclan.com/games.php?ID=27 Asteroid's Revenge: play Asteroids as the asteroid and destroy the little triangles.
http://www.rssowl.org/ RSSOwl is an open source RSS feed reader. At the moment I'm using GreatNews RSS Reader, but I'm going to try this program out because I really don't like the way GreatNews does tabs with IE.

http://en.wikipedia.org/wiki/Vessel_emergency_codes These are the code words used over PA systems on boats to talk about emergencies.
http://www.neilturner.me.uk/2005/02/05/quickly_compress_png_images.html Adding PNGcrush to the Windows shell.

http://www.fatchicksinpartyhats.com/
http://www3.addall.com/ Enter a book's name or ISBN into this site and it will display the price from different web vendors.
http://www.thinkgeek.com/gadgets/electronic/8c52/?cpg=42H The latest in annoyance technology.

http://www.sel.barc.usda.gov/diptera/ann1.htm Dr. Seuss made this book to teach GIs about malaria.
http://www.funny-games.biz/splash-back.html A fun bubble popping game.
http://images.businessweek.com/ss/06/11/1129_makingof_lego/index_01.htm How Lego bricks are made.