Juan Ignacio has published a new build, a DIY ez-FET lite:
I have a few MSP430G2955 around but non of my Launchpads are capable of programming this MCU. Texas Instruments released a while back all the informtation needed to build the new ez-FET lite. The eZ-FET lite is a low cost USB-based on-board emulation solution for MSP430 microcontrollers. This debuger supports all MSP430 devices compatible with SBW programming and I could use it to program the MSP430G2955.
The hardware is based on an MSP430F5528 and I used a QFN version with an adapter board
Project info at ssihla site.