Let the hive mind of Engadget get that for you.
"I need help! I want a small pocket camcorder but I'm not sure which one to get. I don't want to fall into the hype of the Flip because I worry two hours won't be enough. What should I be looking for when considering a small camcorder and where can I get a good quality one with expandable memory? Thanks!"
The AM21 is not yet available but it's coming VERY soon. The national rollout of the code for the HR21s is in progress that supports it and some companies are taking pre-orders for it.