For tents, we have two tarptents that fit well for tall people. My solo is a Tarptent Moment, and our double is a Six Moons Designs Lunar Duo.

Clothing is an issue. Even at "only" 6-2, I have problems with sleeve and body length, as most of my height is in my upper body. Patagonia tops seem to have a little extra length in the sleeves, which is nice. LL Bean offers a lot of their house brand clothing in Tall sizes, as does Eddie Bauer, though I'm not sure even those will fit well to 6-6.

Beyond Clothing does custom made outdoor clothing at http://beyondclothing.com/. They have a wide variety of serious outdoor clothing on their site -- might be well worth the money for a perfect fit.