A way over-rated program that USA Gymnastics implemented back in the early 90's to attempt to better identify talented kids and to get their coaches the knowledge that they need to develop them properly. There is a physical abilities component as well as a skills section. The kids first test regionally and based on their regional scores, they are invited to national testing. Lately, it's been held down in Houston at the USA Training Center based at Karolyi's Camp.
7 and 8 year olds only test physical abilities. If they make the Diamond Level, their coach is allowed to attend the national TOPs camp with USA Gymnastics footing the bill. The athletes receive a certificate (I believe...) and some apparel of some sort, I believe - shirts? maybe a warm-up? I'm not sure, exactly 9-11 year olds test both physical abilities and skills. Those who score the highest (usually about 20 kids per age group) get to attend the TOPs national camp in which the national staff serve as the clinicians. Again, USAG foots the bill for these kids and they get a warm-up, leotard, shirts, etc. About 4 or 5 years ago, USAG started offering a TOPs "B" camp for the next tier kids who did not quite make the "A" squad. That camp is offered the following week after the "A" camp. However, the gymnasts must pay their own way and pay for the camp itself.
I've coached in a few gyms with TOPs athletes and they weren't anything special outside of being great at leg lifts, rope climbs, etc.
When you break down the percentages, most of the kids don't make elite and those who do would've made elite even if TOPs had never existed. Talent is talent. TOPs is not the savior that made a kid an elite gymnast.