I just picked up a Teensy 3.1, which is an ARM development board that can speak Arduino. OSH Park was running a special where I could tack one onto my order for a few bucks. It’s pretty neat.
The only downside is that the design doesn’t have pin labels on the top of the board. This makes it really tough to use in a breadboard. To fix this, I made a label to stick to it to call out the pins — posting here in case someone on the internet could use such a thing.