I just upgraded my blog from version 3.8 to the alpha of Ray Camden's excellent blogCFC 4.0. I have a lot of customizations for my site, so it's never a *simple* task. After running the database scripts to add the new tables and constraints, I used WinMerge to diff the new code against my current code base. This helps me see the differences between my modded code and Ray's base code and approve changes on a line by line basis. Very handy.

Nice features in 4.0 include the addition of TrackBacks, RRS 2.0 and lots of other goodies.