When I was searching for data on the SST planes I actually ran into the Federation of American Scientists. In later surfing I’ve discovered that they are maintaining two REALLY cool web sites:
US Black Aircraft http://www.fas.org/irp/eprint/mahon/index.html
Mystery Aircraft http://www.fas.org/irp/mystery/index.html
Based on other books etc. I’ve read these sites are both pretty accurate, or at least consistently inaccurate. 🙂
-Ian.