To me the side-uino DIP is much more interesting than the smaller unit.
(very similar to the sippino: http://spikenzielabs.com/SpikenzieLabs/sippino.html
The reason that I like it better is few a few reasons, but mainly because the larger unit
can be talked to by using standard things & connectors. i.e. you can hook up an 6 pin ISP
connector, a 6 pin FTDI cable, or even plug it directly into a bread board.
With the smaller unit, you will always have to wire up something to use it & program it.
I think it would helpful on the smaller unit if it had say a 6 pin serial port, or an ISP port,
or perhaps another set of 2 holes along the edge where the digital or analog pins are so
that you could plug in sensors or servos directly. Then it would start to hit my hot buttons.
It would make the board bigger but would it really be bigger by the time you make the board
usable in its current form?
Just my thoughts...