Wednesday's ratings roundup:
A "special" two-hour edition of American Idol averaged 24.6 million total viewers, dropping 1.6 mil week-to-week. CBS' sitcombo of Old Christine (7.06 mil, down 380K) and Gary Unmarried (6.86 mil, down 210K) each dipped a bit. Knight Rider gained 450 thou to hit 5.4 mil, while this week's Lost repeat reaped 4.4 mil.
Opposite Idol's greedy "special" second hour, Criminal Minds (13.26 mil) fell 600K, while Lost sank 11 percent to a series-low 9.76 mil. (That said, Lost was for a fourth straight week Wednesday's highest-rated scripted show in the key demos, and it built its audience from start to finish.)
NBC's Life dropped from last week's well-watched return, hitting a more typical 4.72 mil.
CSI: NY dominated with 12.85 million viewers, gaining 1.1 mil from its last fresh outing. Law & Order (7.52 mil) plunged 13 percent, while Life on Mars (5.14 mil) lost 860 thou.