Some of us have been capturing video since the beginning via Cycorder on the 2g. The 3G had little or no differences in its capabilities from the 2G. That isn’t the case with the 3Gs.
First, there is a distinct advantage to the 3Gs due to its frame-rate capabilities. 30fps beats the snot out of 15fps any day of the week under any conditions. Double it!
Since this capability is tied to hardware, in this case the processor in the 3Gs has a significant advantage, in addition to the camera itself being upgraded. The example below shows that the difference is clear.
This demo was put together by iPhoneArena [thanks, man]: