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!"
Did you read this little line?
"This $50 accessory will enable HR21 owners to tune into and record OTA HD channels"
Where I live, you can only get Fox in HD OTA, and i hate flipping between DirecTV and OTA, and now that i can finally record Fox in HD, I never have to watch another SD channel again.