These are books we know Desmond read or planned to read. Since he lived in the Swan Station for so long, it's assumed that he probably read many of the books on the Swan's bookshelf also.
Our Mutual Friend
by Charles Dickens
This is the last book Desmond wants to read before he dies.
Haroun and the Sea of Stories
by Salman Rushdie
Desmond had this book about a boy who must save the ocean of stories with him on Oceanic Flight 815 (the second one) in the premiere episode of LOST's final season.
The Third Policeman
by Flann O'Brien