I love Pololu!
I have used their Servo Controllers, Motor controllers, and their robot bases. Top quality at low prices!!
Wright hobbies sells all kinds of great robot parts.
Sparkfun has everything robotics, including robot bases, electronics, and mechanics. They sell Beagleboards, Chumbys, and the incredibly cool Android IOIO board.
Parallax is the perfect vendor for anyone just getting started in robotics. The BASIC stamp is easy enough for anyone to use.
Home of Ladyada and just about anything else a do-it-yourselfer could ever want. They have a lot of original development boards.
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