For those of you wanting to move to 32-bit but miss the ability to whip out that protoboard for a little late night wiring session check out the Teensy 3.0 board from PJRC.
http://www.pjrc.com/store/teensy3.html
I should also note that this project was featured on kickstarter with a $5K goal and recieved over $70K in backing!!! Nice.