I recently bought a Canon SD870 IS as a snappy little camera to take on my frequent hikes in the mountains. It takes pretty nice shots for a little point & shoot. However, my interest has been piqued recently by a website that claims a way to unlock RAW capture capability (amongst other "pro" features) on Digic II & III Canon cameras. It's called CHDK. Has anyone tried this? Seems like a fairly tedious process, but worth it if it works. Thoughts?