If you like ratpoison, you should check out StumpWM. It's by the same guy, but takes the whole customization thing to a whole next level. It's written in Common

If you like ratpoison, you should check out StumpWM. It's by the same guy, but takes the whole customization thing to a whole next level. It's written in Common Lisp so you can connect to the window mananger while it is running and make changes.