BoingBoing's Mark Frauenfelder did an interview with Jesse Thorn on the podcast Bullseye. He describes the Zeo sleep manager, which gives you a read-out on your past night's sleep (I need one!).
And he also recommends GurneyJourney (around the 4:00 mark).
Here are the links to the posts he refers to:
Macro Photos of the Human Eye
Building reference models of dinosaurs
Video of Sketching a Donkey
Portrait of Jehovah's Witnesses
Direct link to interview
Thanks, Mark -- and Heather for telling me about it.