I just put together a nice package for avr users to use under Mac OS X. The zip includes avr-gcc with librarys etc, avrdude, a shell script for the creation of makefiles and a installation how to. It's available for download at
For thouse of you who don't know:
The avr-gcc package for compilation, assemblation and linking.
The avrdude is used for DL:ing the pgm to your micro.
The script file is for creating makefiles.
Hope this can be useful to anyone. If you find any flaws etc, drop me an e-mail.