Got one of these the other day. As an Atmel guy (if you look aside my brief flirt with the Microchip PIC controllers in the beginning), I was curious what the world of TI looked like. A tip led me to the MSP430 Launchpad, and at the cost of $4.30 (+ shipping) I had to get one (I actually bought two)
It was surprisingly easy to "switch", everything worked out-of-the-box. No startup problems, everything auto-detected and... well.. worked.
I ported a 4-bit LCD driver from the ATmega8, and it took me about 15 minutes. Not really sure what I'm going to do with this little guy just yet (why replace something that works?) but I have a distinct feeling it will fit in somewhere, somehow in the near future.