ATmega328P targeted at low-power battery use: help needed with baby steps!

Unfortunately I don't currently even have anything as basic as "make" on my ageing Mac, and my puny SheevaPlug doesn't really have space.

I could/should try and set up a build/dev environment in the corner of one of my chunky hosted servers, but it somehow feels evil using a big fat machine half around the world away to do my uC builds. Still, that's the "cloud" I suppose!

Rgds

Damon