Has anyone tried Akismet, the spam-blocker? In an interview, Matt Mullenweg, founding developer of WordPress, credits it with eliminating comment spam among users. But he warns that if Google figures out how to purge the sploggers from its Blogger service, many are likely to migrate to WordPress.
Well the same thing that makes us attractive to normal people -- it's easy to setup, very scalable, easy to use -- also make WordPress attractive to less savory parts of the blogosphere. If there was something I could do make it harder for them without hurting our normal users, I would.