He's actually looking for hard evidence that traces his account back to his original one, not similarities.

Correct. In fact, there are many replies here, so I'm going to change the rules.

New extra rules:

Anything without "hard evidence" will be ignored, even if the "guess" is correct (note double quotes, even if I am only quoting "hard evidence" by Wardrick!). It needs to be something that would be strong enough to make the authorities knock on my door.
If you are sure you are correct, then make a 0.005BTC donation to the Free Software Foundation https://my.fsf.org/donate/other/ (bitcoin address 1PC9aZC4hNX2rmmrt7uHTfYAS3hRbph4UN) or to torservers.net https://www.torservers.net/donate.html (bitcoin address 14fadryvAkoXye2XtH4qSwSerhi7BX4rtG) and paste the transaction ID of the donation in your message. That will attract my attention. (these sites use a single bitcoin address for all donations)
To avoid people making lots of extra user accounts and making lots of guesses, only accounts registered before the UTC time of this post are allowed to participate.

Very well - I feel pretty confident.
Tx ID: d8b9e9a98ad40cf7853d86b2eae5ccf898cb99040714d58cd7e1d8e5d55b22fe
http://blockchain.info/tx/d8b9e9a98ad40cf7853d86b2eae5ccf898cb99040714d58cd7e1d8e5d55b22fe

See my post above.