Hi Paul
You'll find the 2mp webcams are interpolated and aren't true 2mp. The 2mp is probably a "still" image as well, and that the "video" is probably still 640x480.
You can get 1280x1024 webcams from The Imaging Source - the DMK41AF04. It can do 15fps.
Otherwise, something like a Canon 300d or 350D, controlled through a laptop, can take a picture, download to computer (which could then trigger an upload to a website). But you'll want to resize the image first as it would be quite large.
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