The Complete Beginners Guide to the Arduino. Tutorial as pdf file and example sourcecode are available for download.
Everything You always wanted to know about H-Bridges but were afraid to ask ;-). A very good article about H-Bridges especially MOSFET H-Bridges.
There can also be found schematics, layout and sourcecode for the µModule H-Bridge
Wiring and sourcecode examples for Devantech sensors and controllers, like SRF05, MD23.
UK electronics online shop.
UK shop for robotics & electronic parts, PIC, ARM and Atmel CPUs.
Partial manufacture list: