I do like a lot of controllers (and I am sure there are more to come!)
On the subject of the Arduino:
What is your favorite Arduino (program / form factor) compatible board???
Mine is: The Uno32 because it is a fast Arduino and can be so much more (has a PIC 32 bit chip)! I still wish it was a 5V I/O board, but 3.3V is here to stay...