Thanks for you comments on e2e.  It took us a bit, but we now have a new part number decoder on our Getting Started page!

http://www.ti.com/lsds/ti/microcontroller/16-bit_msp430/getting_started.page

 

http://focus.ti.com/en/graphics/mcu/mcuovw/MSP430_Part_Number_Decoder_2011.png