Some minor additional evidence if someone still is not sure about Nick/Satoshi...

- Check how he use 'btw' here on bitcointalk. Nicks usage of it: http://unenumerated.blogspot.se/2011/05/bitcoin-what-took-ye-so-long.html
- Nick uses double spaces just as Satoshi (look at the source on his blog linked above)
- He uses 'wrt' both here and on his blog. Not that common.