I am under HEAVY attack right now. Some time after I posted (7:19 AM) the attack begun and now I'm adding hundreds of bot ranges per hour. I'm going to keep up with it all day; at least I'll blacklist a ton of them by the end of the day.
I'm considering having an "under attack" mode for CathInfo, where bots and THOSE NOT LOGGED IN TO AN ACCOUNT only see a basic login form. That way, the bots that get through my filter don't get much from my server -- they will end up leaving more quickly, keeping the pipes a bit clearer.