Taking a serious look at the Fast Search plug-in for Movable Type, which, by using a fulltext index for entries, promises (and, based on comments out there, fulfills) much faster searching than the built-in MT search. It also has some nice features like sorting by relevancy and highlighting search terms.
Only two problems I see:
It looks like it replaces the MT search functionality, which is unfortunate. If it didn't, then I could have a "Fast Search" and "Normal Search" option for, say, this blog (which has tons of comments), while having just the "Fast Search" for some place like WIST.
I have a couple of questions in to the developer, so we'll see how that goes.
Filed under :: Blogging
Per the developer, MT4 compatibility is imminent, and it's an adjunct to existing search, not a replacement.
So, most likely, I'll install it here and see what happens. When I get a minute or twelve.