3Lib Steve Litchfield's website. Loads of good information.
Peter Kindström's excellent site Psion site. Excellent for those of us that can read Swedish, at least.
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A good place to buy that secondhand bit of kit for your Psion. A bit pricey sometimes, but offers a warranty.
The company who created all those wonderful PDAs.
Pulster.De A webshop with lots of Psion related goods.