Hi,
it would be nice to get the latest CrossPack into the Arduino IDE. It supports the atmega128rfa1, which is of interest to some of us for ultra-compact RF enabled arduino boards.
I copied the /usr/local/CrossPack-AVR-20100115 to the Arduino application, added the uracoli-arduino package in hardware, and could use the RFA1 (RadioFaro board) straight from the IDE.
I don't know about WinAVR (don't have windows) but the same may apply too.
Thanks,
Charles