Uhh, I don't remember ever agreeing to keep it secret, but we didn't talk about it on the list either.  At that time Hal was elbows-deep in the transaction scripting code, and I was checking Satoshi's work on the crypto on the blockchain architecture. 

Finney had a lot to worry about with the transaction scripting and wound up blocking out about a dozen more opcodes than Satoshi had wanted to, but I found essentially nothing wrong with the block structure.  I am still freakin' amazed how tight he got that blockchain design. 

And, yeah, I'm Ray Dillinger.