Portal: Stonard

Here's three games you can play with portals:
1. Portal Roulette - Place one portal to Stonard/Dalaran, then cast the next one without moving. You have a 50/50 chance of ending up where you want to go. A classic with the Wintergrasp portal!

2. Distant portal - This one is best if you have two mages in on the gag, the first mage says "Portal to Dalaran at the top of the stairs." (Anywhere far enough out of the way earn a groan from users, but not so far they would rather hearth) The second mage then says, I've got a portal right down here. The thankful suckers won't pay enough attention to realize they just went into a portal to Stonard. Only those attentive enough and willing to run the extra bit get to go to Dalaran.

3. Portal forest - Get a large group of mages, drop portal after portal for Stonard and Thunderbluff, but put down one to Dalaran. You need a lot of mages to get the desired effect, but non-mages hunting through 50 worthless portals for the one they want is a sight to behold.

Well there are these things called "Hearthstones"... not very mainstream, but a few well prepared adventurers carry them around

The portal trainer for Stonard (Horde) is at 47.9,55.5 in Swamp of Sorrows.
He's just right of the stairs as you enter the building. If you're facing the inn/flight master, the building with the trainer is about 90° West.