I must second this. I use Locale on my ADP1 (better known as the G1), and it's one of the most impressive things I've ever seen on a phone. I never have to worry again with my cell going off in class, as it knows when my classes are and when to turn the ringer off. This is the precise kind of thing that Apple disallows by restricting you to a set of whitelisted APIs which explicitly do not allow you to mess with system settings or run things in the background. The freedom of the Android market is one of the reasons that I find Android to be a better platform even in a strictly technical sense-- you can simply do more with it.