How many channels do I watch?

After reading this article on Slate, it occured to me that I really could figure out how many of the hundreds of channels I get I really watch.

Once a month: Movies on Demand
Fox
CBS
CNN
ABC
NBC
PBS
MTV
VH1
WB
UPN
TBS
Comedy Central
E!
Food
TLC
Discovery Channel
Cartoon Network (Adult Swim)
Weather Channel
CNBC
CSPAN
CSPAN2
Sci-Fi
MSNBC
Fox News
ESPN

I was a little generous, even if I don't regularly watch the channel, I added it if I could ever recall watching it. So I watch more channels than the FCC found was common on average, but not too many.