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!"
I think rentals will take off when we start to see services through set top boxes and consoles. It's already started to happen and the market will get pretty crowded.
I don't think anyone cares about rental. Downloadable content is a good match for rental because DRM is irrelevant. The issue is with content you own. Who the hell in their right minds would BUY a DLC movie when the quality is so much worse, there are no features, it's tied to a device, your device has finite capacity and you don't even have something to lend to others or sell on later. It's not like the price is much cheaper either. Even an XBox 360 Elite couldn't hold more than 30 HD movies, and probably less than that.