I've used quite a few different window managers in the past, but so far fluxbox is still my primary choice.
I just wished they made releases more often, having to "track git" is just such an annoying trait from the Linux-oriented community.
Not entirely convinced the minimalism offered by cwm(1) is good for my tastes, it's a grey area.. I don't like fancy desktop environments, but a window manager should have a little something to grab onto.