I've talked about comment spam before on this blog and how I'm fighting it with the help of MT-Blacklist.

Here's a screenshot of MT-Blacklist doing its job for me. These are just the patterns I check for, not specific URLs that MT-Blacklist also blocks. I find that the filters are far better if you use regular expressions instead, because the spammers just change the URLs slightly by adding punctuation or numbers.

Can you imagine deleting all of those comments manually? Damn...