By Julianne Pepitone, staff reporterDecember 23, 2010: 2:20 PM ETNEW YORK (CNNMoney.com) -- Online content creator Demand Media filed for an IPO back in August, but the company is still answering regulators' questions about its unorthodox accounting practices.Demand CEO Richard Rosenblatt has been insisting for years to media outlets, including Fortune, that his company -- which churns out vast am