With 2,997,000 viewers, FNC’s Greta Van Susteren recorded her best rating of 2005 on Tuesday night. Last month she set the bar high, with 2.8 million viewers during her reporting from Aruba. But now she has surpassed her own record, beating Bill O’Reilly and Hannity & Colmes at 10pm.

Greta averaged 952,000 viewers in the 25-54 demographic — a number that is significantly higher than Aaron Brown‘s total viewership at 10pm. Shep mentioned Greta’s record-setting ratings on Studio B this afternoon, calling her “the ratings sensation of all of cable news. If you don’t believe it, ask our competition.”

> Also at 10pm: Scarborough Country was the top show on MSNBC yesterday. The show increased +165% from its lead-in to average an “outstanding 212,000 A25-54,” according to a tipster… (Update: 5:47pm: “Can Scarborough’s 212,000 A25-54 truly be called ‘outstanding’ when Greta more than quadrupled it at the same time?,” an e-mailer asks. You decide — but that’s what MSNBC is calling it…