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!"
This is becoming a pretty common tactic here in Europe. In Italy, TIM offers an eee and a 3G modem as part of a bundle for service. Sign a two year contract and pay 29 euro a month for a computer and internet.
Its funny how the technology has brought us right back to the 'People PC' business model.