Ok all i have finally got round to adding more to this guide as druid tanking is very different from warrior tanking and paladin tanking as the druid has many forms as we all know. i will try my best but i have never been a very good druid tank but i know the basic jist of the tanking.
http://www.worldofwarcraft.com/info/classes/druid/talents.html?tal=00000000000000000000050323213232010530125105503301000000000000
Ok in further light of the paladin revisit i will try to break the sections down so it is before pull, during the fight and after pull.
Ok here is the first thing "Before pull"
As with the paladin tanking you will need to have some various buffs up, all u rly need to put on your self is MoTW or GoTW (mark of the wild and Gift of the wild). You will also need thorns ONLY ON OUR SELF it gives agro so u dont want the whole party getting agro so only your self and the other tank if there is one. You will also need to chance into Bear or Dire bear form as they are the tanking forms for druids. it is the same as warriors they gain rage to generate threat.
"During the fight"
NEVER and i mean NEVER use frenzied regeneration it uses rage to regen hp you have a healer for that u want to keep as much rage as you can so only use it if u are 100% positive u will keep agro and u need more hp as the heals are not keeping u up enough but only if u are sure u need it.
Next you need to use "Feral charge" it is like the warrior charge but u can use it in combat (i think) you can either use feral fyriefyre or how ever it is spelt to pull it causes no threat so u need to pick it up asap. Another way to pull is to chance into the Night elf form use Moonfire and switch into bear or direbear form it gives instant agro because of dmg and u can continue to tank with bear form. The main move you want to use while tanking is swipe as it is an instance cast ability and it hits 3 mobs so u keep agro on 3 mobs at once, when u have rage to spare use Maul on a target the dps are taking down as it gives more threat, Use growl when you need to also it is a taunting move that take agro, also use Challenging roar when u need as it is an aoe taunt. Do not chance forms while tanking as it lowers armour and hp so u will take moe of a beating when being attacked.
After pull if you stay in bear form throught out the fight you will not need to mana up u may need to cast a regen on your self for the next fight to keep your self topped up but other than that rebuff thorns when needed and the wild buffs.
If i have missed anything or u have anything to add just add or tell me and i will change it.