Great pics of airshows:
Cool pic of a B2 Stealth bomber in its own condensation cloud ( not from the site above)
http://www.edwards.af.mil/archive/2003/images/b2_over_pacific.jpg
Aircraft cloud formations are awesome.
Contrails
http://photos.airliners.net/photos/middle/0/8/0/0239080.jpg
Wingtip Vortices
http://photos.airliners.net/photos/middle/3/3/0/1008033.jpg