Do you have the contact info. for these companies ?
I beleive contacting the sponsers of the show is much more effective than sending emails to CBS/Late Night.
Here are the advertisers:
TV.com
On The Border Restaurants
Best Western
Intel
CBSports.com
JohnFreida.com
DiTech
Lexus
Earn My Degree
True Credit by TransUnion
Lifelock
Bowflex
Mars Candy
Capitol One
LasikPlus
Embassy Suites
EBay
ancestry.com
When I contacted them, I just used their “feedback/contact us” form on their web sites.