This is great! A few things that might be nice to add are the ATmega32U4 (on the Arduino Leonardo and Micro, among other things), the ATtiny85, the ATtiny84, and these resonators: http://www.digikey.com/product-detail/en/AWSCR-8.00CV-T/535-...

For hand-soldering, it might be nice to include 1206 packages in addition to 0603 ones, although I realize that would make the list much longer.

Another good reference for this kind of thing is the Fab Lab inventory: http://fab.cba.mit.edu/about/fab/inv.html and it might be worth looking that over to see if there's anything that seems worth adding.