3 mission arc from Rupkerr in Feerrott gets you a bunch of xp at the final turn in. The first mission, if you are lucky, can be done in 5 minutes per person, and is worth 2aa or so at 90. They are called An Expedition Gone Awry, Uncovering the Truth, and A Cursed Cure. Also in Feerrott is the kill 16 lizards task from Ashrin T'Vahn called Appeasing a Teir'Dal isn't too bad either, and has a shot at some named. I only do these tasks, though, if no one is camping the ghost area (3 mission arc) or the Sentinel named (lizards by CT), otherwise it's a waste of time.
2 missions from Scholar Kintorom in the Library. Both can be done together and take a total of 5 minutes per person most of the time (plus however long respawn is on the books/mobs). 2aa's each at 90, and most of the time you only have to kill 2 mobs total. Unfortunately to get to repeat them you have to do the last mission in his arc as well, and you probably will need help on that, but once it's down you can do these 2 every 6 hours easily and very fast. On Bert the library is almost always empty so this is usually a slam dunk run.
I avoid House of Thule in HoT as the place is camped 24x7 on Bertox.
I avoid Eruidin Burning in HoT as the place is cramped and train central on Bertox.
In the Well do the All is Not Forgotten Part 1 and All is Not Forgotten Part 2 missions. Part 1 you can do even if the zone is camped - just get people to let you loot the rotting scrolls - and is worth 4aa at 90 to complete. Part 2 is essentially a "kill 10" task with a couple quest named at the end, and is not too bad if you figure out your positioning.
In the Grounds do the kill tasks for dogs, snakes, etc. Go to the gnome, get the set of kill tasks, go smack mobs, and as soon as one is complete get it again quick.
In Toskirakk do the pigs - slaughter em enmass and also smack whatever ogres you can get. Or do an ogre camp.
In Field of Scale slaughter all the animals in the zone enmass. You can do the Food Supplies task for Severilous while doing this. If you haven't done the Grand Illusion arc from Phara Dar, make sure to do that as the mask is very helpful in the entire FoS theme.
Kaesora Library hotzone is also good...and while in there grab the various tasks from the dragons in FoS that send you there.
The OMM missions in PoK used to be ok, but no longer give xp so won't help you now. While it's running, you can do the New Years tasks from Kilna and Pizmip (new bazaar zone in PoK) for some xp, but the xp ZEM in the instance really is bad...but it is something to do.
Raspers is a good place to look to get an idea of what you can do where and how much xp is gotten. Not 100% accurate, but it is close enough...
http://home.comcast.net/~mathadon/Guides/index.html
Stay out of Underfoot for the most part, unless you are already flagged. If flagged for tier 8 there, then do the inventor's task The Grand Experiment, and his other task as you get enough drops. Also Searching for a Cure which is also easy. One exception: Do the Filling the Repository task from Magnite Ordinator Bammor in Peculid Grotto - its not too bad and there is a safe spot for all the pulling you have to do, etc.