These are some pictures of aircraft that I think are pretty cool.  Note the C-5A Galaxy, I worked on these while in the USAFR.  And my brother worked on the C-130 and F-16 while in active duty with the AF.
SR-71 Blackbird
Stealth Bomber
"B-1 Bomber"
C-130 "Hurcules"
F-16 "Fighting Falcon"
F-117 "Night Hawk" Stealth Fighter
C-5A "Galaxy"
The Air Force Commands each have their own "patch" or "shield".  Each shield is unique to that command, here are two that I especially like.
Air Intelligence Agency
This was the command I worked for, while in active duty. (formerly known as Air Force Intelligence Command AFIC)
Air Force Space Command
(does the triangular symbol in the center look familiar?)
The F-22 Raptor is the USAF's newest addition to its "fleet".  It is more advanced than the F-15, and is designed to replace the Eagle, as the AF's long range fighter.  The F-22 also has stealth technology.  Below is a link to a page full of pics of this aircraft, below each pic is a headline that gives information about this jet.  Read up on all the specifics, this is one awesome bird.
F-22 Raptor
AF Link gallery of F-22 pics