I am a Shaman, and have been asked to be the oftank for several normal dungeons. What mix of gear and talents would be best to main tank normal outland dungeons (at 70).

Yes, I am aware that Shamans make poor tanks due to threat generation issues and no taunt, but for the lower level dungeons with lower level dps (my friends alts) how viable is it, and how hard do you have to try to get high enough defense to make you healable.