I am not sure how I have missed this... but Atmel has an official GNU/GCC based Toolchain: http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2725&category_id=163&family_id=607&subfamily_id=1965
It appears to be Windows only. Seeing this is GCC, does anyone know where the source is? I am a Linux user, and looking for avr-as support for the tiny10. The official toolchain seems to support it.
p.s. I am sorry if this belongs in in AVR GCC forum...