I just made the plunge for a new SD850 IS, and I was wondering.... The included battery charger is nice and all, but it would be really fantastic if I could charge it through the included mini-usb cable. Then, when I travel, the only power adapter I would need is for my computer and I could use that to charge my camera, phone, BT headset, etc etc. Some brief (ok, so I spent 5 minutes on it) searching does not reveal anything. Anybody have any idea?