As for resto, the only comps id suggests are a double healer variant or wld.  Wld, although deemed "obsolete" in wrath, has still seen some success so I am not going to count that comp out.  As for double healer comps, double healer/hunter comps have been fairly popular, although most run with a paladin/sham instead of a paladin/druid. I still think it could work though to get WOW power leveling.

For the Blizzard tournament I plan on playing both feral and moonkin specs. In terms of comps, it depends on who I play with. I have been contacted over the last few months by a handful of different sponsorships looking for teams, a couple of which have recently found teams some time afterward, though I will not name about WOW power leveling.

What do you find to be the most difficult comps for a Druid team to play against?

I think that depends. Teams with hunters are difficult, but then again, what teams with hunters are not? It is more apparent when you are running a cleave variant because although druids can shift, they need to waste a few globals to get through the trap a bit faster about WOW power leveling (assuming charge is down). And since paladins are so prominent atm, it is not always easy to slow and get behind the target, and charging will not keep them in place either. I would say just any team that has alot of snares, because although you can shift out of them, you still have to waste globals shifting, and thats less pressure youre putting out about WOW power leveling.

Chimera Shot - Remove the Viper sting tool tip as viper sting is no longer a hunter ability. Serpent sting does the same damage and modifiers chimera shot in the same way. Scorpid Chimera stays the same except the sting is now a bleed to get WoW Gold.