Meet the Press contact page

MSNBC shows you can email directly

hardball@msnbc.com
countdown@msnbc.com
race08@msnbc.com
abrams@msnbc.com.
morningjoe has a special contact box on the page

cnn.com/feedback/cnntv is the central contact page.  You pick the show and paste in your comment to each show of interest.  Particularly the Situation Room and 360  and Larry King are usually the ones to comment on the primaries as the news
of the votes comes in.

Oreilly@foxnews.com
Hannity@foxnews.com
Colmes@foxnews.com
Ontherecord@foxnews.com
Foxreport@foxnews.com
Special@foxnews.com
Feedback@foxnews.com

nightline@abcnews.com
onlineda@newshour.org
krugman@nytimes.com

Anybody with other addresses add on.