I've heard of a really good idea of grabbing up 25 quests, completing them, and then once Cata comes out, turning them in and getting a great boost on 81.
I've also heard about Blizzard making Northrend quests not give any XP after 80. Is this true? If so, can I get a source link on it?
If it isn't true, Where would be some good locations for big XP quests? I'm sure others would love to know.