I like tweak my prompt and I use zsh, thus I have infinite possibilities :-)
I owe much the phil’s prompt which gave me a lot of ideas.
My prompt is ofcourse in full color, as I’m a fan of that too. (Old UNIX users may shrudder at this point…)
Right now I have a prompt that keeps out of my face, but when needed has some usefull extras; like showing background jobs and showing the exit code of the previous command if it wasn’t equal to zero.