Screenshots may not be the cleanest way to present this list, but at least you won't have to worry about transcription errors, right? Here are some of the many trainable recipes we were able to find in Northrend. Remember that the Grand Master trainers are in Dalaran which you need to be level 74 to do the quest to enter. If you're not that level yet, make fast friends with a L74 Mage who has been up there and trained the Portal spell.
Also remember that some of these may have changed since beta. One thing that hasn't changed is that sweet, sweet ride, the Engineered Motorbike.