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retro:
To answer your original question, the plug that fits the Sony PRS, PSP et al is the EIAJ-02. It is an industry standard, and is available from many sources.
The Radio Shack Adaptaplug equliavent is Size B. They also sell a two pack for hobyists (Model: 274-1532 | Catalog #: 274-1532) if you are comfortable with soldering and want to build your own cable/adapter.
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