Dan Melson of Searchlight Crusade has a great overview and explanation of the main options for financing a home purchase (or refinancing an existing loan). In the last ten years or so, there's been a phenomenal amount of innovation in the real-estate financing market. So, if you haven't taken a loan out (or refinanced one) recently, you might not be aware of all the different ways you can go. If so, this piece would be a good place to start.
And while you're there, be sure to spend some time reading through some of the other material Dan's put up. It's really an impressive array of stuff. While he's also got other consumer and personal-finance pieces up, his information on real-estate really shines. I'd reckon that there are few (if any) other sites that have as much depth and breadth of material in that area.