I'm surprised this news wasn't posted already, but the CodeBlocks IDE development team just released (finally!) a new, stable, official version.
I'm currently downloading it (it isn't on sourceforge, but it is on Berlios - the project page has links), and will report back soon on how it works building UFO:AI (among other projects I'm working on).
They also have a release that includes some version of MinGW, although I'm not sure what version, but I'm guessing it is one of the more recent ones. I'll find out, though, and I'll also see if it works building UFO:AI. If it does, it might simplify the process for those who want to compile from SVN without having a script do it for them.
I'll report back soon on how it works...