Depends on what you're playing a little, you can try this page:
(of course select the chord you're looking for)
You get a simplified chord, a full chop chord, and some trickier up-the-neck chord that may or may not be useful. mandolincafe.com is a great hangout for learning mandolin, finding tabs, etc. Somewhat folk/bluegrass oriented but they have other stuff too.
If you're a fiddler you will feel at home. I guess the new part is to practice the tremolos and cross picking techniques. And yes, you don't hold the mando under your chin :D