I found that my friend's Canon D300/Rebel performs, colorwise, very similar to my Canon G3, and whole it is per say "bad", the colors of the SD10 are simply better, much better in fact.
IMHO, I have shot my G3 in RAW mode enough to know. But the RAW software by Canon does not compare favorably to the Sigma RAW software. Great, so your camera can shoot RAW, big deal. You need excellent software to bring that out. The Sigma software has been highly priased, although I like to see that dumb color wheel replaced with sliders as they have in the latest version of FotoStation. Unless you use RAW in PS7 or PS-CS, you are in bad shape with shooting RAW with a Canon.