I'm still thinking a lot about it, but what I have in mind is moving a community site of my own to WP.
At the moment, the site uses a more or less home made Perl engine with no database and text files instead. There are several "sections" : news, resources, articles, downloads, columns where community members write about their thoughts and lives, and a forum.
I've tried several CMS like *nuke, *xoops and stuff, but none really satisfies me, for various reasons (crap url's, code as complex as hell so you just can't modify things, tons of useless features, ....). And for many of these various reasons, I tend to think more and more about WP.
A particular matter I have in mind is performance. My host isn't that strong and I dont want to install a mySQL hogger that will bring the site on its knees when 50 people connect at the same time. And performance isn't an easy criteria to select with, since every platform claims to be lightweigth and highspeed.
So, I'm asking for feedback ideas and opinions : either you think I'm crazy for this or that reason, know the perfect cms, and I'd like to hear about your opinion. Or you think it's not crazy, even may know about a rather big site using WP, and I'd like to hear about this too :)