MSP430 MCU GCC toolchain can be found here http://mspgcc.sourceforge.net/.
The documentation supplied with mspgcc is very comprehensive and describes the MCU in great detail. Can be found here http://mspgcc.sourceforge.net/manual/. This could be very good introductory material for this MCU.
Tmote Sky sensor module is equipped with MSP430 F1611 MCU. According to mspgcc docs on how to decode MSP430 part numbers (http://mspgcc.sourceforge.net/manual/x675.html).
F1611 - stands for:
- F - Flash ROM,
- 16xx - Like 14x, but adding 2xDAC12, 3xDMA, brownout reset and I2C,
- xx11 - 48K ROM, 10K RAM
Manufacturers page for this MCU - http://focus.ti.com/docs/prod/folders/print/msp430f1611.html.
Key documents about this MCU: