Commercial:
British Pacific --Good guys to deal with
Rovers North --Also good guys to deal with-but a little more expensive
Atlantic British --Source of Santanas (for now)
LR Supermarket --Good prices, prompt shipping
Wise Owl --Good source for hard to find stuff/also handles parabolic springs
Great Basin Rovers --Heavy duty axles, diffs and the like
DAP --Another good source of hard to get stuff
Ashcroft Conversions --Driveline components including the high ratio transfer box
Badger CoachWorks --as original as it gets interiors
East Coast Rovers --High end, very nice Rover products
LaSalle Interiors --Very nice fiberglass door panels and headliners
TI Console --Located in The Netherlands-nice selection of driveline and brake components
Gower Oaks LTD --Original Smiths style gauges and sending units
VDO gauges  --where I got my gauges, however (good prices and look pretty good too)
VDO homepage

Good BBS
Rovers North Series Board
Guns and Rovers Board
Black Stump Land Rover Board
Nates Message Board --ok, this one's really slow
British Bulldog Board  --I don't frequent this one much

Sources of Land-Rover Info
Ottawa Valley Land Rovers --tremendous fund of knowledge on a wide range of Land Rover Issues
The Series Shed --great source of info, plus vehicles for sale, techtips etc
Land Rover Owners Mailing List --you should join...or at least search the archives
Bayou Rover  --Good tech tips, good information, enjoyable reading too
Overdrive  --pictures of a Toro and Fairey overdrives (neither manufactured anymore)

Miscellaneous Products
POR15 --very good paint-like substance-they sell other interesting chemical compounds too
Overlander --A website with a ton of info about Land-Rovers, caravaning, etc--commercial content
British Metrics --British thread adaptors, taps, dies, wrenches and wotnot
Maryland Metrics  --Another source for British thread adaptors, taps, dies, etc
Victoria British  --sometimes the only place to find old British Vehicle parts
Harbor Freight  --good prices and often free shipping on heavy items
Eastwood Co  --General automotive restoration stuff
Currency Convertor  --Good for those "across the Pond" orders