Ramon Alban's collection of articles on the fuel injection of the SD1/3500, useful stuff for the Wedge fuelies, especially the TR8 but also relevant for the TR7 FI as many of the Bosch components and functions are similar
The British Car, The Wedge Shop's forum for British cars. A great place to be if you're thinking of hot-rodding your wedge. Not just a forum however, The Wedge Shop is a TR7/TR8 parts vendor that in many cases is the only US based supplier of some Wedge parts. The forum has lots of good advice, and many TWOA members frequent this forum too!
The Triumph Experience is a great forum for all things Triumph. Part of the Autoshrine network, there are always quite a few TR7 and TR8 folks hanging out on the forum. Quite a great site to get unbiased help.
The Temple of Triumph in Tallahassee, FL has an archive featuring copies of the Triumph Sports Owners Associate (TSOA) newsletters from issue 1 in 1955 through to the final issue in 1982. The TSOA was a factory-sponsored Triumph club. The newsletters cover all models of Triumphs, and include interesting reading on the introduction of the TR7 and TR8.