Running against AVR Eclipse Plugin 2.4.0.201203041437
When run with avrdude 6.0rc1 (available at http://download.savannah.gnu.org/releases/avrdude/), the "AVR Supported MCUs" tab shows red crosses against all MCUs. Any attempt to upload reports "AVRDude does not support the project target MCU".
Replacing the avrdude binary & config with avrdude 5.11.1 makes things work as expected.
I've attached the output from avrdude 6.0rc1 (as far as I can tell, the regex in AvrdudeTool:getMCUs() should match, but maybe I'm missing something).
This problem has been solved in the more recent GIT version. You need commit f4cde1e7fe.
The biggest problem I have is that I don't know how to do a proper release. Anyone out there?
If you're adventurous you may want to build the plugin yourself. I've create a branch called R2.4_Maintenance.
For the time being you can use this update site. It has the beta version of 2.4.1 with a fix for avrdude 6.0
http://www.ijzerbout.nl/avr-eclipse/updatesite