Over the last few weeks I noticed this site becoming steadily slower. Turns out I had an unusual amount of requests for /xmlrpc.php.. which in turn caused the server to use up all it's http processes answering bogus rpc queries for ping backs and whatnot that the nice script kiddies all over the world are trying to exploit I guess.
So... took care of that. Hopefully things are back to normal. I'll have to go back and re-evaluate if I actually want any of that functionality I guess.