My experience leveling through Outland was pretty short on dungeons. Lots and lots of DK running around, a few miscellaneous other classes here and there, and no healers. Ever. I didn't even bother trying to find dungeon groups...I just pushed through.
If, however, you are hell bent on tanking, "of the Champion" greens are mediocre but not bad for tanking (though you'll pay out the *** for them on auction and they won't last long...you have the entire cobalt tanking set to look forward to at 70). If you haven't done the Overlord quest yet (Alliance side...forget what the name might be Horde side) you can nab the Regal Protectorate which will actually last you through a fair bit of Northrend as far as tanking trinkets go. Generally speaking, however, Outland was very skimpy on tanking plate quest rewards and even tank plate dungeon drops were few and far between. With the nerfs to XP requirements from 60-70, investing a lot of time putting together a tanking set for Outland dungeons is not really going to serve you very well.