Thursday, by the numbers:
Survivor topped the hour with 12.6 million total viewers, slipping 400K week-to-week. Ugly Betty followed with 8.3 mil (dropping 10 percent). NBC's Earl (6.75 mil) dipped 250 thou, but Kath & Kim (5.47 mil) claimed 470K extra heads.
Stealing fourth place from Kitchen Nightmares, Smallville's thoroughly crashed wedding saw 4.77 million people RSVP, quite possibly setting a new season high. (This Thursday's CW ratings "asterisk"comes to us courtesy of the Cincinnati-Pittsburgh NFL game.) Update: Smallville's final audience is 4.18 mil.
Business as usual: CSI (18.4 million viewers, down 570 thou) drew the biggest audience, Grey's Anatomy (15.74 mil, its best numbers since the season-opener) dominated the demos. In third, The Office (8.4) inched up 220K from last week's season low, while 30 Rock (7.3 mil) lost another 210 thou. Supernatural, at 4.03 mil, appears to be up a bit over last week. (Update: Supernatural's final audience is 3.34 mil.) Reminder: No new Smallville or Supe' until Jan. 15.
Eleventh Hour dropped nine percent but still bested ER for the No. 1 spot — 10.67 mil to 9.15 mil. Life on Mars, which just got an additional episode order and is moving to Wednesdays in 2009, fell 11 percent, to a smidge under eight mil.