get a good thermometer, one with a remote sensor and a one of the pager type units so you don't have to babysit the whole time. keeping the temp right, enough water in it, etc, all very important.
don't slice the meat up when you first take it out, give it a few minutes!
try different meats, etc, use different types of wood (maple, apple, etc) take notes and learn from it.
bacon wrapped jalepneo poppers are awesome in the smoker
do up a bunch of sausage, and have different hot sauces and mustards, great way to sample things like that.