Wait, wouldn't that not really do anything?  I mean, you have names-linking-to-websites turned off.

That is exactly one of the reasons why I have it turned off - I can't sit here and ensure that every person that makes a comment is linking to a legit website.

However, to answer your question, yes it would do "something" if I approved the comment. You see the spam filters uses bayesian analysis. In other words, it "learns as it goes". Every spam comment that I mark as "not spam" is recorded as a false positive by the spam filter. So, the next time a comment - that may be spam - is made by the same person, that comment is more likely to be approved by the spam filter as opposed to if I didn't approve the first comment.

For example, I was *almost* tricked into allowing a spam comment. What the spammer did was copy a legit comment that was already posted:

So when I was looking over the spam comments I thought to myself "wait a second, I swear I remember reading this comment before – why is it marked as spam?" I was just about to mark the spam comment as not spam and allow it to be posted when I realized that it was a spammer that was duplicating a real comment. Sheesh – tricky, tricky.