Best Pre-paid data plan/USB Stick Comb in Germany

code prole writes: With two upcoming trips to Germany, and no readily available Internet (WiFi or otherwise) in the location where we'll be staying, I'm looking for a no-contract USB stick and pre-paid data plan. Vodafone has a huge selection of USB sticks but has proven to be unresponsive to questions about data plans. And the US based T-Mobile Help Center was clueless about getting the device in Europe and using it there. Hopefully the Slashdot community has some suggestions? Duds to avoid?