I personally just use the iPod AC to USB adapters. You can buy them dirt cheap online (I got 2 for like a buck fifty last time I ordered some). Only one per adapter, but being that cheap, shouldn't be that big of a deal.
Most of my devices use Mini USB, so that makes it easy too. For my 505, it will not charge over USB unless it is actually attached to a host device (basically, only on a comptuer), but I have a USB to barrel plug adapter for it (PSP shares same charger as the Sony Readers, and PSP USB adapters are cheap and easy to get).
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