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!"
The only reason I am (was?) considering the Homeserver over the time capsule is the ability to have multiple drives, if this doesn't have it either A) I'll get the old one, B) I'll roll my own C)I'll get the time capsule.
Does anyone know if the old one has any sort of expansion other than USB? I'd be nice to throw in a 802.11n card and make this a router.