The newest version of Tmux (1.4, released Dec 2010) has a bunch of fixes and subtle workflow enhancements. Unfortunately Yum still only has 1.3.
You can compile it from source here. I did and got the following errors:
After checking around, I discovered I was missing these two packages:
yum install libevent-devel yum install ncurses-devel ncurses
Recompile and you should be golden.
Addendum: on a fresh Ubuntu install it’s:
apt-get install libevent-dev apt-get install libncurses5-dev libncursesw5-dev