SomaFM. Beat Blender, in particular.
Thought of the day: I discovered a remote SQL-injection/XSS bug in a product I work with this week. (Not related to the below story, I assure you.) What surprises me in retrospect is that (a) I should have seen this 2 years ago, (b) the speed at which it was fixed - (2 days to patch - impressive!) , and (c) It was so obvious. It was hiding in plain sight.
Other stuff: GoogleBrowser is incredible. And, everywhere displays should, if there's any justice in the world, catch on like wildfire.