I work for
http://www.adexchanged.com and we run a site that does 1 to 1 impression sharing. At this point we're in public beta and we need to know how usable our site is. All you have to do is try out out site and use our code on at least one of your pages and in a week from now give us some feedback. I'm limited to 100 sites that submit feedback but all the information is available on the site itself. The feedback will be one through our site so you won't be advertisting for us and we even want negative feedback because we want to see what your opinions are.
Thanks