MortgageRamp, the Dot-com turned technology firm, surprised many analysts and industry executives with its ability to survive, and now the company is planning a full-throttle assault on the commercial real estate industry with its DealCentral technology. While dot-com lenders were falling by the wayside in the last year, MortgageRamp, which tried to make its mark as a loan matching dot-com in January 2001, shifted strategy dramatically after a few months