I got the mortgage headlines from MarketWatch. About 6 months ago I e-mailed them and asked them to post the headline numbers when they come out Wed. mornings. To my surprise they did it.
but the full report is a subscription basis. I find it hard finding any more info other than those headlines. About every other week someone will report on the weekly survey itself but with few details. I track it weekly due to my interest in shorting homebuilders.