A Readable Feast has this fine post about Pirates. Did you know there's a Talk Like A Pirate Day? (Wasn't the Bones episode when they talked like pirates cool?)
Some YA Pirate titles:
Piratica by Tanith Lee; this is full of humor, as Art suddenly remembers she's the daughter of a Pirate Queen and goes about assembling her mother's old crew. But things aren't exactly as she remembers.
Airborn by Kenneth Oppel. Matt Cruse is a cabin boy in an airship that runs into air pirates.
Pirates! by Celia Rees. Slightly more historically accurate than Tanith Lee, but still full of adventure.
The Pirates of Pompeii by Caroline Lawrence, for Roman Empire-era pirates.
What pirate books have you been reading?