We're huge fans of Seattle's commercial hackerspace, Metrix Create:Space. Matt Westervelt, the founder, has been an unstinting source of help and support for us. He was just interviewed by Inkfarm, and he talks about the huge variety of useful resources available in the space. You should go check it out.
I will be giving a workshop on Arduino shield design this thursday (24 March 2011) at Metrix:Create Space in Seattle. You can register in person at Metrix or over the phone. I'll be covering the basics of designing and building your own shields, with a motor shield demo project. The cost is $50. Participants will need a laptop, an Arduino, and a USB cable. A protoshield and other required components and tools will be provided. Hope to see you there!