Code Composer Studio v4 and MSP430 development
I just got one of those $4.30 MSP-EXP430G2 boards, and, having worked with both Eclipse and CCSv3 (the full license version), I also downloaded CCSv4, thinking that would be the path with the easiest learning curve.

There may be some kind of tutorial on the MSP430 launchpad wiki, but I haven't found it yet. Ideally there should be a how-to that shows, starting from scratch, how to create a project and get it into the device. If I do find such a thing, I'll edit this post to try to include the correct link.