Zillow today launched a tool to help borrowers comparison shop for loans. At the Mortgage Marketplace, if you enter your zipcode, the amount you want to borrow and your credit score, the site promises to email you lenders' quotes. The site is free for borrowers; lenders pay $25 to sign up. So far, 1,214 users have requested loan information (including us), and lenders have responded with 640 quotes. We're still waiting for ours.