Andy Ihnatko uses the go-action tiny video camera GoPro Hero HD for still shots. The quality is surprisingly good, especially considering it's marketed only for strapping on ya when doing extreme sports.
(Dang, the thing weighs less than 100 grams too!)
Hmmm, it just occurs to me that I don't know of any other super-wide-angle cameras which are not much, much larger and heavier than this thing. Interesting. Might even be interesting for candid street photography.
I got this via Andy's twitter stream. I've bitched much about Twitter, but I have to admit when used right it has some good uses. He said, hanging his head in shame, thoroughly chastised.