I found some interesting MSP430 projects on the simpleavr.com website, including this LaunchPad Shield. It is just a breadboard for prototyping, but I thought it was pretty neatly done. I may create a variation.
There are a couple of other projects posted as well, with the promise of more to come.
Also, this person works exclusively in Linux, so if you are a Linux user looking for help on the MSP430, you may want to check out this site.