Referral spam: Please help!

If anyone knows how to combat referral spam (or referrer spam), please help me. I spend about an hour every day sorting through my referrer logs and adding new misspellings and whatnot to my .htaccess file, but it obviously does not work. It does drive away all the "referrers" with URLs containing the words and letter combinations I've added to the .htaccess file, but they come up with 50 to 100 new ones almost every day. After only a month, my .htaccess file is getting HUGE.

I really don't understand why they put so much effort into targeting this blog. I mean, I don't have a "recent referrers" list and I don't follow the links to their bogus web sites.

Someone please help!!! Thank you.

Aimless