Not a hornbook, but the Property E&E is phenomenally helpful so far. I have found E&Es on other subjects to be somewhat helpful, but the Property one is really awesome. I also suggest the Workbook on Estates & Future Interests by Coletta. It's nothing but 340 pages of problems to work through, identifying the estate, title, present & future interests, and even what the answers would have been in 1600. And it has some sweet little summary charts in the back.