Ok, I have this site with .co.uk extension. The site is equally relevant to US as it is to UK users because the niche is not restricted to UK traffic. However, since I have .co.uk domain, I was wondering what would be good ways to increase US traffic from the search engines to the site. Although the site has almost an equal amount in US to UK traffic, I think if I had a .com extension there would be even more US traffic, possibly substantially more than UK.

Its quite an aged domain, so how do I go about getting more US traffic?