SparkFun Forums 

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Discussions on the software and hardware for Atmel's STK standard.
By Caffeine
#12703
I bought it a few years ago. It's great for getting stuff up and running really quickly to try new ideas out.

I use AVR-GCC now though, bit more 'serious'
By stevech
#13070
ZBasic for the AVRs is truly impressive
By mramos1
#13767
Have you checked out bastoc.com, the RVKbasic is free for I think 200 lines of code.