Compare my tmux.conf (http://pastebin.com/m2394d7a2) and my screenrc (http://pastebin.com/d7bb649a5).

Granted, my screenrc is a hotchpotch of cut-and-paste and default stuff from lots of places, but that's actually the point: I could read through the tmux manpage and set up tmux the way I wanted, without cobbling a conf file together from the blog posts and mailing list emails of wiser people.