I found an interesting but old analysis from Don Stewart about trends in the tiling window manager market.
I was curious so I tried to make it again to see the result 8 months later.
I took the vote data rather than installed, because it's more accurate: it tries to count people who use the software rather then people that just installed it. And we all know that installing a software does not mean you're using it.
awesome is rising fast. It has overtaken larswm and xmonad very quickly. Now it seems it just kicked wmii out of the game, and the next target will be the famous ion3, which should be deprecated in some weeks.
I'm very impressed. I never though it will happen that way. That stats, so it means anything you want them to mean, but I think it's very cool anyway. 
I think that the next thing to do is to beat the floating-only window manager like the *box, etc… An interesting challenge, so stay tuned! 