Texas Instruments has quite a bit of very good information available on their web site. Unfortunately, it is spread out over multiple different locations. The three primary locations are TI Focus, The TI Processors Wiki, and the TI E2E (engineer to engineer) community. There are many useful sub-sections in each of these areas (often with overlapping information) and I have only provided sub-links to some of the more frequent places I visit directly.
MSP430 Focus Home