Yes, I have read all of the OBrian books and loved them.
I would also throw in Sail Trim.
Here are two books I know anyone who sails will enjoy:
A Voyage for Madmen by Peter Nichols
This is the story of the first Round Alone Race. A great read.
His other book, Sea Change: Alone Across the Atlantic in a Wooden Boat is an absolute must read if you can find it. It is a memoir of his transatlantic journey from England to the US on an engineless wooden boat. Sounds boring? No, here is the rub...He finds his recent ex-girlfriend's diary on board, (She was doing everyone in town), and his boat is slowly sinking. It's a train wreck and the best part is that it is true.
I just picked up his newest book, Evolution's Captain and will let you know how it reads.
A voyage for madmen is an awesome book !