It is quite a bit different but have you seen the Itead "duinos"?
http://imall.iteadstudio.com/itaeduino-leonardo.html
http://imall.iteadstudio.com/im130312001.html
http://imall.iteadstudio.com/iteaduino-lite.html
What I like about the layout on these boards is that you can use
Arduino shields, add a header to use strip/proto boards, and plug
in headers from sensors to use any of the analog or digital pins.
Kind of the best of all worlds.
It does most of what the sensor shields do.
(Note the 3 pin header ordering of gnd, +v, S which allows direct connection to most servos)
I also like the 3v/5v switch and the 4 pin header for i2c.
--- bill