One of my favorite sites on mortgages is THE MORTGAGE PROFESSOR. Jack Guttentag, the prof., himself, deserves a shout out. He's a finance professor at the Wharton School of Business, and he talks a good game on the subject of mortgages.
When I studied for my degree in finance, or my law degree for that matter, I didn't have any professors this good. His mortgage-related tools and tutorials are easy to understand, and are great for both novices and mortgage divas, alike. Props to the prof!
Brian L. Sirota, Esq.