Message spam has almost completely dried up. In the last 15 days I’ve only had 4 pieces of it, according to askimet. The only thing I can think of was that a few months ago I made my page un-indexed by Google - and this either stopped the spammers from finding me, or decreased the value of my blog to these spammers (I imagine it’s a combination of both).
Not that it’s a really big deal, askimet was a real wiz at catching all the spam anyway - I just found in an interesting phenomina.