OK, I upgraded Movable Type to 2.5. Everything went so smoothly I was rather surprised. I can't tell much difference but 2 things...there's some automatic trackback autodiscovery thingie where you don't need to do anything, it will check out the links you have selected and if they allow trackback it will ping that site automatically. The other thing is some other site blo.gs or something like that is pinged...