Check out tricks by Benoit Nadeau and Doug Fearman.

Also check out flat-picken (a la Doc Watson).

I started off with a two finger and thumb (like Earl Scruggs (http://www.earlscruggs.com/) but not anything like as good) and moved that across to a flat picking style. I really like it and find that it is very versatile !

If you go to the Earl Scruggs link be sure to have the sound up on your computer and you will be treated to a bit of free foggy mountain breakdown ! Wonderful!