Has anyone found a good way to display directions (or even maps) when you're biking to an unfamiliar location?

I have the routine part of my commute down fine, but I freqently find myself going new places for events, etc. I always resort to writing the directions on my hand, sweating them off on the way there, and replacing them for the trip back, but it's kind of a drag. I'd love to be able to access printed out directions or a small map somewhere in my line of sight.