Hal Finney's site for RPOW, his reusable proof-of-work server launched in August 2004, with pages explaining its design, security and FAQ.
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Finney's RPOW FAQ: how RPOW differs from hashcash and ecash, why the central server is a crucial element rather than a bottleneck, and why the IBM 4758 was the only possible platform.
Finney's rpow.net home page: RPOW lets hashcash tokens be reused in sequence, runs on an IBM 4758 whose attestation lets anyone verify the code, and could serve as a form of Nick Szabo's bit gold.