Glad that helped... corel is (my opinion) one of the most flexible graphics programs, it can import end export from and to almost anything.
I often use it as support to autocad, hehe.
Of course dwg can't be translated straight to swf, you need an indermidiate, and that's corel.
Bird view can be made out of 3d models with autocad, yes. I don't know if those are made with autocad, but that doesn't really matter.
I edited my post above, I use X5 suite