Information and tidal data for the Dorset Coast
Lundy Island - the "official" website for Lundy - lots of information, including details of accomodation.
Photography - The Geograph project aims to collect geographically representative photographs and information for every square kilometre of Great Britain and Ireland - there are some useful coastal shots.
British Canoeing website.
British Canoeing Sea Kayaking site.
Bing Maps will help you find places mentioned.
Military Exercise Areas - the Lulworth Ranges - details. Ministry of Defense contacts for some of the military exercise areas are to be found in this discussion and this one. See also the Ministry of Defence webpages for contacts.
Planning your first multi-day trip? Mark Rainsley's article "a Special Kind of Freedom" is essential reading.