I like having extra information in my prompt, but not to the point that it takes up a whole line of its own. Here's what mine looks like: http://grab.by/26hX
The first one is git status: Magenta means there are unstaged changes, cyan means there aren't. Star is master, I have different symbols for a few different branches I use on some projects. Otherwise, that symbol just shows as the branch name.
The second symbol is my currently-active ruby interpreter.