Infrequently Noted

So there's a lot of to-do in the blog-app world about comment spam, and here's what I don't get:

Blog people seem to think their messages are any different than anyone else's. Why?

Now that there are interesting and usable approaches to dealing with spam at the edge nodes (baysean filtering seems to be winning the day for those that have it), why can't the same approaches be applied to blog comments? What makes a comment entry so different from a comment on a blog?

I argue nothing.

I fully expect to see the Thunderbird plugin for comment spam filtering any month now.