So far, the sponsors have included - that Genji store - Sotx - Hi Qua since a few weeks ago, almost all the ads are badminton related!
the ones that i see most often is: www.badmintonwarehouse.com www.hiquasports.com www.wembleysports.net a couple of squash stores another few generic sports stores. one i saw just now when i was setting up in another server is badminton.net (San Diego Badminton Supply). not sure why they aren't showing regularly. badmintonalley popped up a while ago, but suddenly disappeared, they are probably not interested in advertising via Adsense i know for sure that SOTX is in the Adsense program, but their bid $$ is too low to show. i haven't seen ads from the Genji store either.