Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
I've played with this at RadioShack ($99 after rebate and 2 year activation). It's interesting. Texting isn't bad on the phone side, it's a little small, but you can get a full 3 lines on it.
Pro: Nice screen on mp3 side, i like the touch control. A case that comes with it doubles as an extended battery. $99. very thin and light.
Cons: All that screen space is begging for fingerprints, one of my pet peezes. the whole flip thing is controlled by a button, you couldn't set it to motion detect, not even as an option? it's pretty annoying sometimes.