If you don't yet know what the AVR Eclipse plugin is:
It is a plugin for the popular Eclipse IDE to support the avr-gcc toolchain. With this plugin you can develop your AVR C or C++ applications in Eclipse, using all Eclipse features such as
- automatic makefile generation
- code assist
- SVN and CVS integration
New in version 2.2 is support for avrdude, so you can upload your projects directly from the Eclipse IDE to your target processor.
Feedback, bug reports and feature requests are always welcome.