Here are some resources I found tooling around Google looking for background info on the Age of Sail. Enjoy!
AGE OF SAIL
Naval tactics in the Age of Sail - Wikipedia, the free encyclopedia
DEVELOPMENT OF SQUARE-RIGGED SHIP - WELCOME!
NOAA Ocean Explorer: Observations on the Gulf Stream
Life at sea in the age of sail : Ships, seafarers & life at sea : Maritime, sea & ships : Fact files : Learning : NMM
Naval Warfare in the Age of Sail
NAVAL HISTORY IN THE AGE OF SAIL (1650-1815)
Pirates & Privateers - The History of Maritime Piracy
Sea Battles in the Age of Sail
The Legacy of the Age of Sail.
Tactics in the Age of Sail
Sailing Navies: Links - Age of Sail - General