AMERICA'S GOT TALENT
NBC, 8:00 p.m. ET
SEASON FINALE: On CNN tonight, it’s one kind of popularity contest. Here on NBC, it’s another, as the network presents the winner of cycle number 10. A one-hour summary of the final acts is followed by a two-hour live finale, in which America chooses among a couple of comics, a couple of magicians, a mentalist, a ventriloquist and a few other acts, including some singers and one, um, regurgitator. If you watch only one America’s Got Talent this season, this is the one. But if you don’t watch one, that’s okay, too…