Google's display ad business is about to explode (in a positive way), according to a new report. Omnicom Media Group has supposedly committed to spending hundreds of millions of dollars on Google's display ads over just the next couple of years. To provide a little background info: Omnicom Media Group is the media services division of Omnicom Group, which has over 5,000 clients in 100 countries. It includes three full service media networks, and can, in other words,