Discoweb
Looking for Help diagnosing an issue with your rover? Disco web is a great resource that will help you get you rover up and running or start you on your path to modifying your rover. 

Pirate4x4
A great source of information for those looking to move beyond the standard Rover modifications. 

Solihull Society
Quite possibly the best north American based Land Rover based 4x4 club. The Solihull Society is know for their annual Rally that is attended by Land Rover owners from across the US.

Off road guides
Nick Weede of off road guides has put together a great collection of GPS track logs that are available for download on a donation basis. Don’t leave home without them!