Found a little place called Meeko's something or other - just a hunting shack in the forest. Go to look around the tiny one-roomed building, hear a funny noise, turn around and there is a fudging great big dragon blocking the exit and blowing fire in through the front door. Anyone who has been to these hunting shacks knows there is less room in there than you'd get in a shoebox so I'm pinned up against a wall next to some dead rabbits and I'm not going to lie here - I yelled out in real life because I was so surprised. Got its head stuck in the doorway so I blasted the living crap out of it with frost spells until it died but it took a good chunk of health off of me before I managed it.
Just finished the questline for the mage's guild, or whatever you call it this time around. Teensy couple of tips here for those who aren't a high level (I'm only 10):
1) When passing through the last passageway before the boss fight at the end of the Labyrinthian (where you get the staff of Magnus), a load of crystals will shoot destruction spells at you. They are VERY strong and if you aren't a high enough level, they can own you rather quickly. Best thing to do is equip a restoration power and cast it while sprinting through. You ought to be ok so long as you don't stop or slow down.
2) The boss fight is easier if you do it at a lower level as Morokei won't use some of his spells on you - however, magic seems to not work as it either makes hardly a dent in his rather large health bar or he seems to take it for his own. Either way, a traditional weapon is a better choice. Enchanted ones, again, lose their charge within a couple of hits so just grab something with some wallop to it and batter him. He will stay still if he can see you so this makes it easier. Whack him until he dies and then don't forget to take his mask because not only does it look cool, it regenerates magicka 100% faster.