Just a few I have ported over with no problems:
LIC Aeronca Champ series including the beta released Champion 7AF Tri-Traveler.
Manuele Villa's SVA 5 and 9
Two of Stuart Green's WW I fighters, the Pfalz D.IIIa and Fokker D.VII have been made FSX able with new model files.
I also was able to port the AG two-seat Spitfire over with no problems.
Note that most all FS9 ported aircraft will not work in DX10 Preview, so if flying an FS9 posted aircraft that works, you must do so in DX9.
Caz