I've owned a Glif iPhone stand/tripod mount for over a year and it's the best iPhone accessory ever.
Glif tripod mount for iPhone. I use it with a Joby Gorillapod tripod.
Glif Tripod Mount & Stand for iPhone 4 and
Dan Provost & Tom Gerhardt is raising funds for Glif - iPhone 4 Tripod Mount & Stand on Kickstarter! Glif is a simple iPhone 4 accessory with two primary functions: mounting your iPhone to a standard tripod, and acting as a kickstand to prop it up.