Wrapping up Canon's PowerShot rollout for the bulk of the year are a trio of its AA battery-powered A series cameras. Fronting the group, the A2100 IS replaces the A2000 IS with a smaller, nearly all-black body but with a sharper 12-megapixel image (up from 10) and a switch to the DIGIC 4 chip powering most of Canon's point-and-shoots this year. The swap gives it full scene recognition and face
