Here’s the plugins, what they do and where to find’em:
Akismet
Akismet checks your comments against the Akismet web serivce to see if they look like spam or not.
Will automatically delete comments that are held for moderation for any reason.
adds a “Delete comments as spam” button to the comments mass editing page, and adds email addresses, urls, and IP addresses, and any links in the comment body to spam words list.
any comments that contain a Spam word will be refused immediately(may be redundant with comment killer, but hey – they started)
Spambots – eat my shorts.
no ugly words here – Hah, it works!