Wouldn't say its a strong feeling dude not like the feelin I get sometimes

but I think for quality reasons even when you squish down to 320x240 on youtube ...640x480 will result in a better sharper image if you use it when grabbing your frames. Also you can submit your wmv / mp4 or whatever to youtube / break / revver at 640x480 and it will look better and give viewers the option of viewing in HiQuality mode.
Its only a matter of time anyway before online video sharing goes to true 640x480 ...thats if they don't shut down Youtube soon