One coincidence is that Finney was diagnosed with ALS around the same time Satoshi stopped posting. On the other hand, if Finney is Satoshi, he would probably like to use his bitcoins to fund ALS research.
Similar to your {0} and even earlier:
https://groups.google.com/forum/#!topic/alt.privacy.anon-ser...
Additionally, Szabo was an employee of Agoric Systems, publisher of the Agoric Papers [1], a treatise on market based systems. He was also an employee of Digicash [2], a failed electronic money startup created by David Chaum.
However, Szabo has released a bit of code [3], which is very different than code I would expect Satoshi Nakamoto to have written.
That said, for someone who was a professor at GWU law school, there is a remarkably small amount of public information about Nick Szabo.
[0] - http://w2.eff.org/Net_culture/Folklore/Humor/squish.hoax
[1] - http://e-drexler.com/d/09/00/AgoricsPapers/agoricpapers.html
[2] - http://en.wikipedia.org/wiki/DigiCash
[3] - https://github.com/nicksz/jTime