Before the year 2000 the only way you could get a steak cooked with infrared technology would be to go to a restaurant that had an infrared broiler. After 2000 this technology started being offered to the public through infrared grills. The technology has evolved and there are now some good infrared gas grills reasonably priced being offered.
Infrared technology in grilling allows the grill to get very hot somewhere between 400 and 900 degrees. This is an ideal situation to cook a steak where you want it cooked on the outside but still rare to medium rare on the inside. Sometimes we call this cooking a steak Pittsburgh style. Due to the high heat infrared grills are faster at cooking items than conventional grills.
In a regular grill the food item being cooked is cooked by the air being heated that surrounds the food item. The heat slowly penetrates the food item in order to cook the inside of the item. The longer the item stays on the grill the more moisture that escapes the item thereby drying it out. If you like your steak medium well you can be sure it will be dry and tough. Passing hot air over an item is exactly how dehydration works so it would make sense if you are doing the same thing on a grill you will eventually have a dry product.
Infrared gas grills use infrared heat that penetrates food items without heating the water molecules and cooks the food item evenly inside and out leaving you with a finished product that is cooked to the consumers liking while remaining moist and juicy.
There are two players in the general consumer infrared grill market and they are TEC grill and Char-Broil. Both offer a great line of grills utilizing the infrared technology from fancy high end home models to portable infrared gas grills.
If you are in the market for a new grill be it for the home, camping or tailgating an infrared grill would warrant some heavy research before you make your final decision.
Update 2012/2013: Infrared gas grills are getting more prevalent in the market place and are a very good alternative for reasons mentioned above. More makers with more models mean better prices for the consumer. Even companies like Char Broil are coming out with consumer based models. Check out the BBQ Guys first on your search for a good grill.