A Denver-based brokerage, Kentwood Real Estate, has paid seven figures for the Internet domain name Denver.com.According to Domaining.com, it's one of the priciest "geo-"domain sales in history, and may represent a new frontier for real estate. Details of the transaction, which closed last month, have not been disclosed. But both sides -- buyer Peter Niederman, CEO of Kentwood Real Estate, and seller Dan Pulcrano, CEO of domain manager Boulevards New Media Inc. -- confirmed that it was a seven-figure deal. "With the advent of IDX, what's the difference between one broker and another in a certain market?" Niederman said. Denver.com -- which Kentwood Real Estate had already been partnered with as featured real estate brokerage and listings provider -- is Niederman's answ...