http://www.youtube.com/results?search_q ... 34l0j2l2l0.
for starters

I always tell my class mates in the aeronautical engineering program that we in aircraft design stand on the shoulders of giants. Our fore-fathers in aviation did incredible things and kept pushing the limits and all the wizardry of designs today is proof of their progress. The F-22 was born out of the P-51, the B-52, born out of odd-ball planes like the Martin Bombers or XB-15.
Point is, remember the odd-ball planes, the failed designs, the still-born birds, and the ones that were just too far out in left field!