THe site looks good, works fast. But I would dump, real fast, the adsense ads. Find something else that is better, a good banner exchange or better yet, find good affiliate programs and rotate their banners through the site. Same with the page where it shows the new url...affilaite banners rotating there would be good.
It takes a long url, usually those long identifiable affiliate links, and shortens it down. So you end up with a url like http://www.b1url.net/sam When you use that url, it redirects to the original long link. And does not show the long link in the browser bar. See this one: http://www.b1url.net/joe Now the downside to using url shorteners: More and more people are getting wise to seeing them, and they are getting wise to the fact that it will go to an affiliate site, sales site, etc. Then will the shortener site go down? If so, your url is useless. This seems to happen a lot with tinyurl.