I found this great cable for a PSP that seems to work well. It is a split power/mini usb cable. Quite handy since it only uses one port, then splits it into data and power cables.
In the office, I use it and insert both plugs into the back of the docking cradle. When I go on the road I can just throw the one cable in my bag and I'm ready to go (and it charges my psp too!)
-k
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