I am getting too much follower spam

It seems that almost every time I post any kind of update, I always get an e-mail saying that someone has begun following me, and they are usually people who are following a lot of people but have few actual followers. I am getting really sick of the follower spam, and it's getting to the point where I'm starting to dread updating twitter because of the inevitable cycle of posting, getting followed, getting an e-mail and then blocking the person (or, more likely, bot).

Is there anything I can do to reduce my follower spam? For the last half dozen updates I've made, I've picked up at least 1 unknown follower each time and I do not want them. I enjoy twitter because it is quick and easy (I update twitter / facebook etc. all using ping.fm), but it's not quick if I have to block someone every time I make an update.