Surplus Electronics from Allelectronics
New integrated circuits from Arrow
Embedded micros [much more powerful and better priced! ;-)] from Atmel
Surplus stuff from Electric Goldmine
Batteries from Evercel. These rock. You can also see a graph of EVRC
Polypropeline straps from Samuel Strapping
Voltage Drop and Current Capacity for large loads
Voltage Drop and Current Capacity for _larger_ loads (thanks Brian) ;-)
Here are links to other people's EV pages that strike me as cool. This is a new feature, so it may take some time to fill up