Get a thick metal pan that is big enough to accommodate the food in a single layer. The holes should be wide enough to allow heat and smoke to reach the food directly, and the rim of the pan should be low enough that you can slide a spatula under the food.
You can now find brushes with silicone bristles that are dishwasher safe. Much better than synthetic/natural boar bristles that you have to wash by hand.
Bamboo skewers are always an option for kabobs, though flat metal skewers or double-pronged ones do a better job of holding the food in place.
Portable surfaces for oiling and seasoning foods. Convenient landing pads for food coming hot off the grill.
Once it gets hot on the grill, you can sauté, stew, pan-roast, or bake just about anything in it without ever worrying that the skillet will discolor or deteriorate. Get one that is at least 10 inches in diameter.
Now you can buy a rib rack and roast holder in one. A rib rack on one side holds multiple slabs of ribs upright, freeing up valuable real estate on the cooking grate. Flip it over and you have a roast holder, perfect for your whole turkey, chicken, or roast.
Available in large and small sizes, disposable foil pans offer many conveniences. Use them to move food to and from the grill, keep food warm on the cooking grate, soak wood chunks in them, or set them under the cooking grate to catch food dripping.