Well here is the first thing you can change. I"m guessing many Americans are immediately confused by your site. Are the papers you're including Australian or American? They might immediately be assuming that it's only Aussie papers. After all, you have mostly Australian testimonials there.
I'm looking at your site and nothign I see tells me it's applicable to Americans. It looks purely Aussie.
I think you'd see a big boost in conversion for Americans if you simply made it clear that your CDs included data on US newspapers and not just Australian ones.