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I just bought this waterproof USB socket for my bike and I have to say it's pretty awesome. Thought I'd post it up for anyone who hasen't seen one. It has a self reseting trip fuse built in as well.
the rubber cap for the end of the USB cable comes with this silicone tape to keep it totally water proof, I'm going to toss a tube of heat shrink over it too just to make sure it stays on there and totally dry.
I got it at http://burnsmoto.com/ $24 for the port - $10 for the rubber gasket for your USB cable. $5 at Autozone for the SAE connector I'm using to connect it to my bike for a quick connect and disconnect
I made the Cell phone mount from the belt clip for my cell phone case and the base is made out of fiberglass. the small 9in USB to microUSB cable came from my BlueAnt bluetooth headset. haven't seen any of those anywhere though I haven't looked very hard since I had one already