Acorn Brewery of Barnsley are releasing a series of single hop beers for 2008.
Each of these beers features an American variety, and if Acorn's success with their single varietal British hop beers is to be replicated then these should be worth seeking out.
I have a lot of time for Acorn; their beers are consistently good tasty brews. I also have a lot of time for American hops, even in the relatively moderate amounts that British brewers use them.
Acorn beers are regular visitors to Leicester pubs where I am fortunate enough to go fairly regularly, so I'll hopefully see a fair few of these beers. If you taste them before I do then let me know how you get on.