Mark Zilbert (rhymes with Dilbert, we suppose) is one casualty of the condo collapse in Miami, according to today's Wall Street Journal. But rather than taking a swan dive off one of the city's near-empty buildings, the downtown residential real estate broker is changing his web site's name from CondoFlip.com to CondoSupercenter.com to more resemble a discount retail operation. Says Zilbert, explaining why he has flipped his business model: "We clearly don't have one buyer for every apartment being built." Clearly.