I used to buy so many books, but haven't bought many in the past decade. I guess computers took over my brain. The last ones I bought were John Scalzi's "Old Man's War" series, which was awesome. Scalzi, the man himself, is also awesome.
The two books I always have by my bedside are the The Complete Novels and Stories of Sherlock Holmes, Vol-1 and Vol-2. They're great for reading one or two in a quick read, if I'm having trouble sleeping, and to me Holmes stories never get old.