DoApp Inc. (www.doapps.com) has a mobile publishing and advertising platform that works in real estate and content distribution. They are in over 120 markets and deliver over 20 million daily ad impressions. The real estate offering is in both the United States and in Canada with a heavy market share in the U.S.
Founded by Google's first UI Designer Joe Sriver who was there from 2000-2006 Sriver lead the design effort for Google Toolbar, Adsense, GMail, Books etc.
DoApp was part of the 2008 release of the "First 500" apps having 3 of top 50 for the first three months of apple's iTunes store.