Heat? Grab one of those handy usb cooling things. My dad has one. It is basically a standard laptop stand, but it has fans on the bottom, and the computer rarely breaks 25c. It's USB, so while it does use battery, it's also portable. I'm sure they have it at
www.apple.com.
Macs do have monitor outs, you just need an adapter to go to RCA or what have you. They're pretty cheap.
Sorry about the card reader. It was something sacraficed for other features.
I love me Firewire external HD. It's fast enough to do whatever I need.
I'm not sure about the DVD zoom ratio thing. Mine usually take up the whole screen. I'll have to check it out when I get home from work.
Enjoy the thing!