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Just to let everyone know... Thing may be different at other companies (I work for Countrywide) but for Prime Conforming Loans all lenders follow FannieMae guidelines. Go to www.fanniemae.com for more information. This website is a pain to use but has a lot of good information.
As for subprime... I'm in Dallas and I see thing on the news all the time about how bad the market is or what another lender has done. Before you could find lenders that would use your higher fico and I know for a fact that a subprime lender was doing refi's on 1st mortgages with no appraisal. I even know of one that was getting what ever appraised value they wanted.