[stratomorph]

It looks like gcc can be used (http://mspgcc.sourceforge.net/). I'll have to brush up on my C.

[plaes]

Also llvm ( http://www.llvm.org ) has experimental msp430 backend.

[edit] Found the real development site: https://www.fooe.net/trac/llvm-msp430/wiki

[sophacles]

Once compiled, how does the transfer to chip go?

[plaes]

There should be some kind of utilities. So far I have at least used one for Atmel AVR-s and MIPS architectures.

[Tichy]

Same here, but I expect at least C code for those little chips will remain manageable in size.