Ok well, first off, I am sure this has probably been posted but I decided to post in case and nothing came up around this (trying to get out of leecher because I quit using the site for a while).
Basically, at 70 a mage can solo the first few pulls in Utgarde Keep which grant about 5000 unrested XP if they are frost spec. This requires some strategy because you will find yourself going out of mana fast as hell.
Your spec is going to be frost... duh. Maximize your chilling talents to maximize speed reduction, Improved Blizzard 3/3, some mana cost reduction talents are helluva nice. Water Elemental, Imp Ele is your own thing. NO FROSTBITE.
How it is done is by downing the first pull which you can polymorph one and attack the other via kiting. Rinse and repeat, one that pull is over with you can send your water elemental in to attack one pull by the anvils while you icelance the other but I recommend putting it on passive, icelancing the pat and both pulls then Iceblock.. Now this is where it comes down to it, cast your elemental's freeze with ALL MOBS in the designated kiting area which is nothing more than the stairs, the tunnel to the right of start and a small bit around the two anvils.
Once the freeze is casted, mash your blink button so it casts once Iceblock dispels, don't be afraid to dispel it manually and blink. Cast icy veins and quickly launch a blizzard on the mobs, once it finishes, launch another. Run up to max Frost Nova range and frost nova all of them and blink towards the stair case and cast blizzard again. By now you are running low on mana so mana gem. Continue the cycle for a small while except on the third pull... frost nova, CONE OF COLD then blink away and evocate with the freeze.
Continue this cycle until they die and proceed to the big circle room, use the same strategy as the big aoe pull earlier and be careful of the master smiths, they can cast a spell that removes your blizzard chill from them and others so that may pose a threat.
Kill everything from the start until the proto drakes, fully clear the wheel. Loot the greens, maybe blues, enjoy the XP and gold gained. I realize it was a poorly crafted guide but I had no time left. =(