From ESPN's Page 2:

http://sports.espn.go.com/espn/page2/index

THE SURE THING (AT LEAST IN VEGAS)
Back in January, after the Patriots lost to the Colts in the AFC championship, a $100 bet on the Patriots to win Super Bowl XLII would have paid $100. Now, a $100 bet on the Patriots would pay $13.

ESPN researcher Dennis Renno compiled the following lines from the MGM Mirage:

Odds of New England winning Super Bowl XLII

Open (Late Jan. 2007)
8-1 (+800)

September 1:
5-2 (+250)

Before San Diego game in Week 3
4-1 (+400)

After San Diego game
5-2 (+250)

Before Dallas game in Week 6
7-5 (+140)

After Dallas game
10-11 (-110)

Before Indy game in Week 9
5-11 (-220)

After Indianapolis game
2-7 (-350)

After Baltimore game (Dec. 4)
1-7 (-700)

Currently (as of Dec. 10th)
1-8 (-800)
=Z=