I'm slowly moving to TI MSP430... one reason is - I like it more then PIC and second reason is - the mspgcc works perfectly on my desktop (fedora 10) so I do not have to turn on the laptop to start programming... (still using windoze schematic capture / pcb tools dough as I do not fancy eagle) ...
That said, eclipse + meld is what I use...
Meld is ok ( Meld : Home Page ) but not as near as good as araxis merge
I do not use araxis merge any more (not even tried to use it under wine) as I have personal policy to pay for tools I use longer then 1 month (I get "fixed" version first and after 30 days I either purchase or uninstall it)... Was using Araxis Merge in previous company (licenced version) and really loved it.. better then "anything else"