Here are a few links, related with Ultima Online and piracy... and Ultima Online Piracy.

UO Gamers: Rebirth - The Only Pre-T2A Shard, home of The Drunken Pirates
UO Rebirth Stratics - A Rebirth Fansite, similar to UO Stratics
Pirates! Fact & Legend - A good resource on the history of piracy, and the lives of pirates
Turbulent Waters - An OSI fansite, dedicated to martime activities
Pirate Names - Some site I found, a list of piratey names
UO Travelogues - A fantastic log of one players adventures in UO; includes tales of the pirate, Hawkeye Pike
League of Pirates - A sucessful OSI pirate guild; includes details on their adventures