Real estate website Zillow.com said today it broke multiple records for site traffic and user activity in 2009. An average of 8.2 million unique users visited Zillow each month during 2009, which is an increase of 57 percent year-over-year. "2009 was a wild year for real estate, with continued home value declines, government intervention, record low mortgage rates, and an enormous amount of consumer uncertainty about what the future holds," said Spencer Rascoff, Zillow's chief operating officer.