Working by Robert Caro   I was able to get some family history as a result of reading this book and asking the last survivor of the appropriate age cohort about the events in the book.
Lyndon by Merle Miller Both of these first two books gave me new perspectives on LBJ. I am reading them for a play in progress.
Ringworld by Niven
America in Chains by Maclean
The latest releases from Flint and Weber
The latest from Dewey Lambdin and Robert Macomber
I always have several books going at a time. It keeps me from becoming stale.