Clicky is a real time web analytics service. As of March 2011, we are tracking over 300,000 web sites, and on a daily basis have about 45,000 visitors generating almost 300,000 page views.
We have a very targeted user base: people who run web sites! Most of the sites are blogs or business-related (ecommerce and general info sites). We only want ads relevant to this audience. And ABSOLUTELY NO ANNOYING/BLINKING ADS!
Ads are shown very prominently in the header of our reporting interface (the core function of the service) to our non-paying users. As with any freemium service, most of our users are on the free plan. To see an example of the ads in our interface, please see http://clicky.com/bsa-example