When we were in New Orleans, I ran into a little problem -- I ran out of power on my cell phone. Now, I have 4 cell phone batteries, and they were fully charged when I left, but husband and I shared the cell phone (WMWifiRemote) for wireless access in the hotel room.
We were at Embassy Suites and they charge for the wireless <snarl>
I had remembered that Office Depot had a few solutions, but we tried three Office Depots and didn't have anything. Finally in the same parking lot of Office Depot was a Radio Shack and they had the iGo PowerXtender. Man this thing works well. About two 2AA batteries equals a cell phone charge. It takes a while for the electrons to go into the phone, but you can stick it attached in your bag and let it work.
Now I have a love/hate relationship with Radio Shack like all ham radio operators, but this one was pretty courteous and even they couldn't understand why the iGO was in the different spot. You can also buy it on line. I've looked at their adapters and are tempted -- BUT it's much easier to just go on EBay and by a second adapter. I can usually find them cheaper than what they sell the tips for.
I have the iGo Bluetooth keyboard (which they no longer sell) and love it, so expected a good experience. I even ordered tips for my bluetooth and my ZUNE and they work well too. So now an extra gadget in the bag which comes in handy.