First of all, I wasn't sure if this should go in exploits or exploration. It doesn't really have a USE per-say for an exploit, more just flying around, so I thought here suited more, however.
Title says it all, really. Go to the portal to the Isle in Shattrath, use Zen Flight while on the ground, click the portal, and ta-dah you arrive on the Isle of Quel'Danas, able to fly around and chill, etc. (Found this out while going back to farm that darn Belf transform item)
Searched for this, I found a similar topic, but related to DMF - the basics are the same though, so I will give praise to IndigoHaze for http://www.ownedcore.com/forums/worl...light-bug.html (Yet another Zen Flight bug....)
Hopefully this helps some people, this is my first real contribution for these forums.