Seattle-based Zillow said today that it has expanded its iPhone App, adding support for its Zillow Mortgage Marketplace through the app. Zillow said the app now allows users to research, shop for, and compare mortgages all directly from their mobile phone. Zillow previously offered up access to its Zillow Mortgage Marketplace through a separate app, rather than integrated into its primary Zillow iPhone app. The new integration comes along with other updates, including faster map performance, saved searches, and other enhancements