I found some stuff you can do in dalaran and on the ships in icecrown. Alliance only i think sorry for hordes
Get to Horde area in dalaran.
1. Go to krasus landing and get on your flying mount.
2. When you fly into the horde area you have 10 seconds before you dismount.
3. if you land on the ground you will be teleported out. Land on a building you can stand there while everyone else stands there saying WTF how you do that!
Mount inside one of the ships in Icecrown
1. mount on your flying mount outside the ship and fly up there.
2. DO NOT LAND but hover just outside the inside part of the ship at the back and as the ship moves you wont and viola you're inside