propane 99% of the time. When I want more smokey flavor I'll sitck some smoking chips in an aluminum foil bag with a hole in it. I use dry chips and the oxygen depleted environment of the foil bag makes them smolder rather than burn, making for lots of smoke. If there's too big, or too many holes in the bag the wood chips will catch on fire, burn hot, and not make much smoke.
I also cook my bacon on the gill. I just place my griddle on there and have at it. No mess or smoke in the house, and the bacon comes out real nice becaue the grill gives off much more even heat than two burners under the griddle on the stove top.
To keep it photography related: