http://download.eclipse.org/tools/ajdt/36/dev/updateAspectJ-aware PDE export facilities are currently broken. I am not planning on fixing it. Instead, I have been working with the PDE team on an alternative solution. See Ability to override javac task during pde builds (Bugzilla). I'll write more about this later, but the solution is much more elegant than what is currently available in AJDT for 3.5 and earlier.
Also, as a bonus, this version includes intertype declaration (ITD) -aware Java search. Finally, ITDs are completely first-class citizens in the workspace. I'll write more about this later, too.