I hate comment spammers. Truly hate them. They are the lowest of the low.
Thanks to these jerks we all have to moderate our comments and carefully review new user signups on user contributed sites to try to stop them polluting the community. Once you have a big community of users, they can help with the burden, but for a small site owner it really sucks to have to wade through all the spam posts.
There are some great tools out there to help stop comment spam such as captcha plugins or spam filters like Akismet which work great. However, there should be some better way to punish comment spammers.
It would be great if there was a blacklisting system where you could report spammers and have their sites get reviewed and possibly de-indexed by the major engines. The spam reporting features for Google for example are heavily focused on spotting and reporting spam results in the SERPs. If we could instead report the comment spammers as soon as they start posting, perhaps they could be eliminated before they get any SEO benefit at all.