I have a sinking feeling that because I am based solely in the UK I'm being restricted from the US advertisers. I just started promoting blockbuster links and I noticed they are only for the .co.uk site. Problem is my site is 90% US users, which is alienating them.
Don't e-mail the programs, get on the phone and talk to someone. It's the same way for people in the US trying to get on a UK network. All it takes is a few phone calls and talking with the network. Call the network initiate the contact and talk about why they need you.
Most advertisers simply have a separate US and UK scheme that you have to sign up for and you just have to dig it out. Sure it's not lurking round there somewhere?