In the third quarter of 2008, the top four sellers of alternative mortgages to Fannie Mae and Freddie Mac accounted for 70.2 percent of such sales, according to a new ranking and analysis by Inside B&C Lending. The government-sponsored enterprises pooled $17.24 billion of interest-only mortgages, jumbo mortgages and 40-year mortgages in their... [Includes one chart and one graph]