[...]
Total hotel, meeting rooms and "a couple" of $1,000-a-night hospitality suites topped $400,000.

Flights weren't cheap, either. Fifty-nine House
and Senate staff flew commercial during the
Copenhagen rush. They paid government rates -
$5-10,000 each - totaling $408,064. Add three
military jets - $168,351 just for flight time -
and the bill tops $1.1 million dollars - not
including all the Obama administration officials
who attended: well over 60.
[...]

http://www.cbsnews.com/stories/2010/01/25/cbsnews_investigates/main6140406.shtml

Cafferty on Pelosi concerning the trip video:

http://www.youtube.com/watch?v=A6_xgKWzhRw

IT'S NICE TO BE ABLE TO PARTY ALL OVER THE WORLD ON OUR CUFF . NOT A MORALE IN THE BUNCH .

What do you expect?
It's their money, we give it to them.
Doesn't matter that our country is going down the tubes.
I'd be willing to bet they were thinking what the heck lets go to Copenhagen we may never get another chance.