I collect Elvis biographies, also Georgia O'Keefe and other artist bio's. Currently my bookshelves are overflowing. I also have mucho design books. I've kept most of the books from different interests over the years. Vedanta, astrology, New age. I don't keep fiction very long here; I'm more likely to let them go first.
The most riveting book I have read is Where White Men Fear to Tread, by Russell Means, a fabulous book on his life, which follows recent American Indian social history for the last 2 generations. I will have a copy available soon (I also have 2 autographed copies, but they are staying with me.)

Current wish list: Books about the Pale of Settlement (Jewish settlements of Eastern Europe) at the turn of the 19th century.