Sorry for no video, this was more of a spur of the moment thing, so I didn't download fraps!
Anyways, to start with go to the place where The Wizard Tokair starts flying in his "Flying in Ghostlands" video (shown in spoiler below). Also, you need to either have a flying two seater mount and bring a friend along, or bring a friend that has one.
[spoiler]
The Wizard Trokair's "Flying in Ghostlands"
[/spoiler]
Anyone who hasn't watched the recent RAoV video probably should. Pay attention to the 'mount exploits' at 4:26 in the video...
[spoiler]
RAoV's "RAoV The Movie" [/spoiler]
Now the 'tricky' part. Instead of using a two seater ground mount like RAoV did in their video, you need to use a flying two seater mount. The passenger just lags himself out using the guild bank macro while the mount's owner recasts the mount 2 times and then waits for the passenger to stop lagging. What ends up happening is that the mount will be visible, the passenger can still jump in and out, and you can fly, but you will be missing the mount buff (and so your mount will not be removed when you fly out of the 'Unknown' zone!). From this point you can fly into Silvermoon and still be mounted, and can explore wherever you want on the continent.
Some pictures!
[spoiler]
Where you start from. If you notice, my friend has no buffs on him, but is flying.
Entering Silvermoon. You have to enter through the actual gates since Silvermoon is surrounded by invisible walls. If you land on the ground though its no big deal, you can fly again afterwards (as long as you don't cast something and dismount yourself).
In Silvermoon...
Looking at the main part of Silvermoon. You can see that my friend has an NPC on the ground selected, and if look on the ramp you can see some of the NPC's (really small guards): this is not 'offline mode'.
Other direction =P
From the top, good luck guys!
[/SPOILER]
(Credit for both videos goes to their owners)