Ratings! Not a definite number but it's better than all the network share ratings no one really gets.
At 9 p.m., CBS' "The Unit" pulled 13 million. NBC's "Law & Order: Criminal Intent" managed 11.3 million. The CW's "Veronica Mars" attracted nearly 3 million.
ETA:
Mars Investigations has the episode pegged at 2.99 million at the moment according to
Mediaweek.
...and some nice things about last week's season premiere:
The CW premiere of "Veronica Mars" retained more of its "Gilmore Girls" lead-in among adults 18-34 (77%, 1.7/5) and adults 18-49 (74%, 1.4/3) than "Veronica" did a year ago following "America's Next Top Model" on UPN.
With "Gilmore Girls" as its lead-in, "Veronica Mars" delivered its third highest-rated telecast ever among adults 18-34 (tie), its second best telecast ever in adults 18-49 (tie), and its fourth most watched episode ever (3.3 million) since its debut two years ago.
Sources:
Orlando Sentinel,
The Futon Critic