I did use xmonad on OS X a lot, and I liked it. Since I live mostly in terminal emulators and vim, tiling for X11 applications was plenty enough. So, I ran X11 with xmonad fixed to a specific desktop (as OS X allows you to specify that an application should always run on a particular desktop). I used the other desktops for Cocoa applications (without tiling).
Unfortunately, Lion switched to Mission Control, and I didn't revive that setup yet. It should be easy to do, since Lion now provides an option to prevent Mission Control to sort desktops by usage.
Unfortunately, Lion switched to Mission Control, and I didn't revive that setup yet. It should be easy to do, since Lion now provides an option to prevent Mission Control to sort desktops by usage.