I have wondered this too. I have a Canon Ixus 55 and would love it to charge via USB. I have managed to find USB charging for everything I carry except this.
and why is most camera dont use regular AA battery? if i out of battery, i just buy some AA almost at any store!
Ken> I can see the convienience of using AA or AAA batteries though I can also see that using fixed sized batteries could increase the size of the camera. Having said that AA and AAA batteries CAN be charged by USB :-)