I got a similar spam to the one mentioned today. It looked like it was manually entered. The guy googled for tool battery blog, found mine and spammed it. either that or a very clever bot.

A while back I noticed that spambots don’t really request CSS files, why would they? so now one of my CSS files is actually a PHP that leaves behind a cookie and it won’t let anyone comment unless they have the cookie. Its obscurity through security but it works, most of the time except for manual spammers

There’s people in India who will sit there and spam blogs all day for a few cents an hour