The built-in tmux session stuff is fabulous. Makes me never want to use normal tmux again. I also quite like that iTerm allows non-Lion full screen mode. That

The built-in tmux session stuff is fabulous. Makes me never want to use normal tmux again. I also quite like that iTerm allows non-Lion full screen mode. That combined with some tasteful transparency lets me see stuff happening while I'm poking around at the command line. It's nice to visually see the result of a Control-C or the relaunching of a web server.