Seriously, for how cheap a DS is (or an original GBA, for that matter), we imagine a practice could just snag a copy of Brain Age and Nintendogs and have their waiting room content and at ease while they, uh ... wait. Might help with those few who become pretty irate when forced to park it in the waiting room.
According to Tara, the practice is run by one Dr. Jade Kim and located in Seattle, WA. You can check out the website right here. Apparently, the DS had Mario Kart DS in there. Awesome!