I agree with several of the posters who thought Kimmie Meissner appeared to be poised to be the next great American champion. Her win at the 2006 Worlds was "awesome", as she herself stated. She seemed to be such a sweet, nice young lady - very competitive - and I thought she was on her way to winning US titles, a few more Worlds, and possibly an Olympic gold medal. IMHO, she appeared to have grown and/or gained weight, and that affected her training. It was sad to see her disappear from the competitive scene. I did see her in an exhibition number a year or so ago, and she skated well, but at a much lower technical level.
Another skater I thought might have enjoyed a long run was Sarah Hughes, whose surprising and well-deserved victory at Salt Lake City in 2002 thrust her into the spotlight. Her skating never was quite the same - too many distractions - television specials, tours, and her college education. She was interviewed by a local New York television station during the Vancouver Olympics, and she was very friendly, happy, and charming. She's obviously happy where she is, and that's what matters.