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!"
Here is a chart showing when you get the resolution benefit for a specific screen size/viewing distance: http://www.carltonbale.com/2006/11/1080p-does-matter/