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!"
There are reports that SkyCable will be mobilizing their HD broadcasts before year-end. From what I've gathered, HBO HD will be included in the lineup. If the lineup will only include HBO HD, I'm not sure. Let's hope they work on other channels and don't charge too much for it.