Recently bought a Cannon PowerShot SD1200IS camera for under $200. 5.1 oz with battery. 10mp. Has a REAL view finder. Uses standard SD cards.
I wanted to replace my Sony Cybershot, which does not have a view finder and weighs 6.6 oz and uses expensive Sony proprietary cards.
Regarding charging. The Sony has a charging/USB base. So I assumed these cameras charge on USB, just like by Blackberry.
I charged the new Cannon battery in the included charger. Then hooked it to the powered USB hub on my computer system, to test the downloading and other functions. The next morning when I got to the trail head, the battery was dead. I figured the USB drained it, which irritated me, since the Sony charges on USB. When I got home, I saw the Sony charger had a 110V cable and USB (I forgot)... so generally, no you cannot charge with USB. But... so far I am thrilled with the weight and small size of the Cannon.