The downside is that the configuration is based upon Haskell, which has a fairly steep learning curve (though all of my configuration was cribbed from various websites/FAQs/etc), and you need the GHC compiler, which uses 600MB. Yep, that’s right. But given that that my main hard drive has plenty of free space on it, this doesn’t bother me so much. It did take me a while to get it working the way I wanted, but once it was working I’ve left it alone and not really thought about it much.

A lot of people like Awesome, and it definitely has all the kewl gadgets/widgets. I was always put off by the fact that the configuration files seemed to keep changing with each release. If that’s stable, then Lua is certainly a lot easier to work with, and you don’t need 600MB for the compiler. The other thing is that I’ve heard mixed things about its stability. Given that XMonad works fine for me, I’ve not been tempted to try it.

There’s also stump which is based upon Lisp. If you like Lisp, then maybe. I know nothing about it though.

The rest are less powerful, but that doesn’t necessarily matter (they can certainly do all that Screen can) if your needs are quite light. A good place to start looking is the Arch wiki, and forums. For some reason Arch users love tiling WMs.