Not sure if it's only in the U.S. but Virgin Mobile (don't laugh) has a portable wifi hotspot. It's $40/month for unlimited data and no contract. So when you get home, just throw it in a drawer till your next trip. You can also get 100 megs for $10.
http://www.virginmobileusa.com/mobil...adband2go.html
BTW, Virgin Mobile is just rebranded Sprint 3G.