After just returning from Britain, I find Life in Elizabethan England: A Compendium of Common Knowledge really interesting. I believe this site is intended as a resource for period writers and re-enacters. The simple, categorized layout is excellent. Some topics:

• How many pence in a shilling?
• Mary, Queen of Scots (accounts of her are unavoidable in Scotland)
• Fun Elizabethan hobbies such as visiting the bear pit
• The short list of men who couldn't find the royal bedroom of the Virgin Queen

(via J-Walk)