ARGanoid's Captain Blood Worship Page: Lots of information (including a whole new language) on one of the greatest computer games of all time.
Captain Blood Shrine @ www.oldskool.org: A site dedicated to this 1988 cult classic.
Hayden's Captain Blood Page: Fan site provides game information, pictures, and guide.
Your Sinclair Review: Rated 68% by Sean Kelly. "Curious game, proving difficult to get to grips with, but which might benefit from perseverence."