Allright, so you want to get into dalaran? But you arent eligable for the questline nor do you have flying (Or dont want to pay a mage to port you)? No problem.
Step 1: Go to Crystalsong Forest.
Step 2: Die on a mob.
Step 3: You appear as a ghost on a flying mount.
Step 4: Fly up into dalaran and go to a spirit healer up there.
Step 5: Log out and back in again.
Step 6: Res at the dalaran spirit healer.
Step 7: Run around dalaran showing your low level awesomeness.
This will trick the spirit healer in dalaran into thinking that you are supposed to res there (For example, maybe you died in VH or something) and you end up in dalaran. Now, I realize this isnt the most useful exploit out there, there are multiple ways of getting in. But at least this one is a alternate if none other are available.
Hope this helps someone.