It uses the same chips but in surface mount - offering a few more analog inputs.
The board is smaller (thinner) and lighter.
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Differences between Arduino and Seeduino: http://www.seeedstudio.com/blog/?page_id=110
there is not much. i believe they use the same ide. Mainly it is just that the seeduino has some different connectors, a different pcb layout, different color.
ohhh... and dont forget, they have different names. :P
Not a great deal, open source, same sort of thing...