MSPDebug version 0.9 is now available. It features support for a couple of new devices (F2132 and F169), hopefully fixed support for 5xxx devices with FET430UIF programmers, and support for the Olimex MSP-JTAG-TINY programmer via either libusb or via a tty device.
Note that command-line options have changed in an effort to keep things tidy, so you'll probably want to check --help before attempting to use the new version. The new options scheme is: mspdebug [options] <driver> [command ...] Where <driver> is one of "rf2500", "olimex", "sim", "uif" or "uif-bsl". You can download the new version from here: http://mspdebug.sourceforge.net/download.html - Daniel