Druids are another hybrid class aside from Shamans. They can heal, deal large amounts of DPS, and tank in instances and raids.
There are only two options for leveling with Druids. You can either spec as a %26#8220;Moonfire Spamming%26#8221; Druid or a Feral Druid which is the better option overall. I suggest using the Feral Spec (cat form) as this will give you the best DPS overall. It%26#8217;s also World PVP viable too.
Dominate the Battlegrounds
That%26#8217;s me in second place in Alterac Valley with 26 kills and just one death, after using this PVP guide which detailed offensive and defensive class specific tactics. I practically just melted everyone with my lightning bolts and chain lightnings. Most of my kills are in 1v1 action by the way. Click here to check out the PVP guide.
Balance Druid
Ok but for those who are really stubborn, here%26#8217;s some talent spec you can start with if you really want to be one of those %26#8220;omfg noob moonfire boomkin%26#8221;:
Click here to view the talent spec
Of course you%26#8217;ll have to get the Moonkin form at level 41 
Feral Druid
Now this is what I%26#8217;m talking about. Not only will you be able to deal a large amount of DPS, you can also rip apart your enemies, Rogue style. The Cat Form allows you to be in stealth mode as you approach your enemies/mobs and then just mangle/rip them apart as you see fit.
Your talents should look like this at level 40: click here to view
Just keep spending talent points on this tree as you see fit. Just take into consideration the amount of extra DPS each talent can bring. You won%26#8217;t go wrong with this tree when it comes to leveling.
Druids in Action
Here%26#8217;s a Feral Druid (old video) ripping people apart in BGs
Here%26#8217;s a Balance Druid doing the same thing in World PVP