Some of these, while new for me, may actually be old. Like the Wired article “the long tail” for example. I’d heard about it, but hadn’t read it yet. :)

• Firefox Aardvark Extension - One of the coolest extensions ever for web developers.
• Napoleon Dynamite Soundboard - SWEET!
• taskTHIS! - Simple, but cool task management, showcasing Ruby on Rails.
• YaGoohoo!gle - Google an Yahoo results, side by side.
• The Long Tail: “Many of our assumptions about popular taste are actually artifacts of poor supply-and-demand matching - a market response to inefficient distribution.”
• Start a fire with a can of soda pop and chocolate
• Guess the Google - Fun game with google images