Haha, man I can’t believe you just wrote this. I went through this whole process (with much googling) about a week ago. Talk about coincidences. This definitely has been a good move though, speed has increased incredibly from traditional setups of Apache and I’m much impressed.
My move was prompted by work on a new Federated Micropublishing tool which for testing purposes is easier on Nginx+Fastcgi then it is with Apache.
I’ll definitely keep this post bookmarked in case I have to do the process again in the future :P!