Because I got inspired by h2's my awesome (wm) config post, I thought I'd share my xmonad config.
xmonad is a tiling window manager based on Haskell and as you can see in the example, the configuration file is written in plain Haskell, and if you haven't been subjected to a functional programming language before, it might look a bit alien, but don't let that scare you off - it's a great language and xmonad is a great window manager. Both are well worth the effort.
I personally use xmonad as the primary wm for my workstation and my laptop, both of which are powered by Slackware64 -current. It just works. Give xmonad a whirl, and enjoy the power of a really cool tiling window manager.