I just bought my picoduino's (two of them) to do a trial run of a lighting kit for hobby items. (for models like cars, star ships, cities, etc.)
I haven't gotten mine yet though. (bought Thursday night and is now Tuesday afternoon. I expect to get it tomorrow though.)
What's cool is that I contacted them about the batteries they mentioned in the description of the picoduino, and they said it will be there soon as they are in talks with a company about making them. They also said that it will probably sell for around $10 and be rechargeable, which it can also be used on any arduino I would guess.
Pretty spiffy website so far, just need to get a few more products. Register before buying from them though. I didn't and it didn't show my purchase on their website, even though I registered from the redirect page. No big deal really as google checkout still completed and I confirmed that they got my order (via contact on their site).
I'm rambling again. Anyway, hope to get my stuff for it tomorrow.