The Summer 2007 programming season may still be young, but so far, America's Got Talent's second season premiere is on top.

NBC's second season debut of America's Got Talent on Tuesday from 9PM to 11PM ET delivered the highest ratings for any summer-series premiere so far this year, averaging 12.9 million viewers and a 4.3/12 rating/share in the Adults 18-49 demographic during its two-hour time period, according to preliminary "fast affiliate-based" "live plus same day" viewing figures from Nielsen Media Research. 

The ratings performance left America's Got Talent 2's premiere ranked as not only the night's highest-rated show among total viewers, Adults 18-49, and all other key metrics, but also left it was the best total viewers and Adults 18-49 numbers of any new summer show that has premiered in the past couple of weeks, which includes the third-season debuts of Fox's So You Think You Can Dance and Hell's Kitchen, and the series premieres of CBS' Pirate Master and ABC's The Next Best Thing reeality series.

Among total viewers, the second season premiere of America's Got Talent was the highest scoring edition of the show ever, besting last summer's first season debut, which averaged 12.4 million.  Among Adults 18-49, the premiere was the second-highest result ever for America's Got Talent, trailing only last summer's debut.