The Woodflame Delecto is a small portable grill. It also has an attached lid that speeds up cooking time. It runs on wood cubes placed in the bottom of the grill, with no aid from charcoal or propane.
The Automatic Chef uses your campfire to cook your food. The round metal grill hangs from a chain attached to an easy-to-assemble metal post. You place the post in the ground next to the fire and put your food on the hanging grill. A battery-operated rotisserie mechanism means your food cooks evenly with little supervision.
Originally designed to be a grill for use on boats, the Sea-B-Que is a good general tabletop grill. It's small, but has a large domed lid, which will allow you to cook larger items.
The miGrill may be one of the most unique grills out there. It looks like your average smoker but it is small enough to be a tabletop grill. It runs on propane. It has built-in battery-operated speakers so you can hook up your MP3 player and fire up some tunes when the food's done.
The Weber Char Q Charcoal Grill looks sort of like a portable version of the George Forman grill. It has large grooves to channel excess liquid and also has a large grill cover to lessen cooking time.
This Char-Broil brand grill is a small grill built for a small camp out. It essentially looks like a metal lunch box with a grill in the middle. Open up the grill, add charcoal, and light it up.
The Coleman Fold N Go Grill looks similar to a waffle maker and is about the same size. It is small enough to fit into your backpack and only requires a small propane canister similar to those used by most standard campstoves.
This Char-Broil grill is essentially the same model as the Charcoal Tabletop Grill. The only difference is that it uses a propane tank to cook the food instead of charcoal.
This grill is more of a camping stove than a grill (hence the name) but it will allow you to cook two different objects at two different temperatures all while using the same propane tank.
If you are at a campsite that provides its own power source---this is a good type of grill for RVers---you may want to try a tabletop electric grill. They're small, but effectively cook your food and usually come with large swiveling lids. The Holland brand makes a reliable, though expensive, electric grill, and there are several simpler models.