I searched and didnt find anything on this. If you walljump just to the left of the beginning of ZF, you can get outside the area behind the instance portal, so you can explore the instanced copy of tanaris. you can go to gadgetzan, but its cut off by a "stuck-falling" wall, where theres nothing past it and if you jump into it your just falling until you can get summoned out. If you go south, you will run into a huge plain white field, its incredibly huge. The main use for this is to stand on the wall behind the instance portal and confuse your party members
Just something i was playing around with, no real use, but hey, whats the use of going to all kinds of cool placed in wow except to get to them
No pics, but its in my video on youtube:
http://www.youtube.com/watch?v=F_gGQ9pVHlw
First part is under org, then its some stuff in gadgetzan (on top of walls, possible ganking areas) etc, old stuff. the ZF part is last.