I am this guy https://bitcointalk.org/index.php?topic=372725.0
I don't know where else to post since I can't post in that thread or the official P2Pool thread https://bitcointalk.org/index.php?topic=18313.7200, but I am indeed the fool in question. I know that these things can happen with bitcoin if you are careless, and I know that none of the miners in P2Pool have any sort of obligation to return my coins, but if you are feeling like a very generous person, my address is 1Jt35Ww1GjM9iGyTM8mAyBmCPPdPz7Z35A. I'd also really appreciate if someone could relay this information to either of those threads.