In addition to the overburdened trick walking at half-speed. : EverQuest 2 Premium Discussions

Also, if you're overburdened, if someone casts spirit of the wolf, or other speed increasing spells on you, you will be able to travel at the maximum speed of the buff until your revival sickness wears off. Pretty much the same idea as casting any form of invisibility spell on yourself; however, you move above even average speed. Pretty nifty for quickly recovering a shard, etc. Hope this helps