Here are some links that I think you will enjoy:

Nantucket Summer Rental: This is a house on Nantukcet that I rent seasonally.

Nantucket.net: This site provides all the informations you will need to have a great visit to the island.

Nantucket Conservation Foundation: Dedicated to preserving the open spaces on the island.

Nantucket Historical Association: Preserving the history of Old Nantucket.

Nantucket Photoart: Beautiful photographs of Nantucket

Shipwreck Museum: Dedicated to preserving and study of Nantucket history and traditions that have been shaped by the island's maritime life.