I've completed the upgrade to Movable Type 2.5. It seems to have gone pretty smoothly. I'm not taking advantage of much more than the ability to ping blo.gs (which I had to go in to my preferences and set for those of you who'd like to do that as well). I didn't try the new default stylesheet, so I don't know if it includes a search box by default, but I know this version has it. So, what I'm saying is: Look for the ability to search this site in the near future.
This concludes this test of the emergency broadcasting system... or something like that...