Good question. We all go through it at one time or another --2000 books on your bookshelf and nothing to read.
I'll be giving a free talk (no registration required) on this subject next week. It will be Wednesday, April 15, at 7:00 p.m. at the Torrance Public Library. The presentation will cover defining your reading tastes, genre descriptions, and internet resources. Believe it or not, FictionDB is not the only resource on the web for books.
If you live in Southern California and want to come to the talk, I'd love to meet you!