The Puppies in Brasillis are nice for daily quests.
Also in the dailies, they can help the Healer NPC restock on their random items that in most cases shouldn't ever have any place in a medical field.
Monthly there's the Monster Extermination (though the waiting sort of kills it when you farmed 250 things on monday and have to wait until thursday or some crap)
There's the plethora of quests related towards unlocking Nameless. If you felt like going the extra Mile, could do the thor's volcano sidequest.
Moscovia is useful to have unlocked, especially while transed (assuming the monster's of the moment aren't freaking amazing at the moment.) It's decent exp.
I've always enjoyed the
Friendship Quest and the
Bruspetti Quests.
Got the Entire Einbroch/Lighthalzen thing with the Conspiracies and the Biolabs and the unethical expermentation on Noob explorers and city bums. Expose their treachery for XP's and the feeling you're a competent secret agent man.
Kiel Hyre is nice to get open.
I would say the new world quests would be a nice option as well, but aside from the Quest to GET to the new world, and maybe the Finding the Fairy/Giant quests, they take way too much effort with all of the customizations that are put into play here on HeRO.
BLARG! Without the repeats, I'd say follow the charts and lists posted by the other guys <_>;; Personally tho, I'd much rather save them XP's for when you're transed and the grind is much much much much longer...