Improve
Feed people around the world at World Food Programme
Give permission to Donate Your Polluted Liver in California

Learn
Unbiased voter information at Vote Smart
Find out if the email you forwarded me is a hoax at Snopes
Learn about your toaster at How Stuff Works

Ponder
Penn Jillette believes there is no God (No, I'm not an atheist...necessarily)
What's happening in Darfur. Also, a cool way to donate $1
Diary of a British soldier in Afghanistan (longer, but great article)

Friends
Sunny Albeau - it's what you get when you get in the tour bus for weeks on end, hanging your arm out the window as you drive the long stretches of road. More specifically, it's my friend Christian and his innovative music project
Ben's Big Bad Web
Great audio/video installs from Fluid Sound

Fun
The end of the world (flash animation)
A video parody of Facebook in real life
The legendary Viceland 'Top Ten Outsiders' videos. Nearly 10 years later, it still cracks me up.
Robot fights (video)