Rotations vary depending on how you are spec'd and how you are geared so this is a rough guide to how rotations should be done for a Druid.
Balance - Single Target Rotation
Moonfire
Insect Swarm
Starsurge (cast every time available)
Starfall (cast every time available)
Force of Nature (cast every time available)
Moonfire
Insect Swarm
Starfire (until you hit solar eclipse)
Moonfire
Insect Swarm
Wrath (until you hit lunar eclipse)
Refresh dots
Starfire
Balance - AoE Rotation
Moonfire
Insect Swarm (do these two first for the sake of your tank and his threat)
Starfall
Typhoon (every time it's up)
Hurricane (spam)
Feral Druid - Cat - Single Target Rotation
Feral Charge (cast whenever available)
Pounce (bleed effect)
Ravage (free due to feral charge)
Faerie Fire (always keep active)
Mangle (increases bleed dmg)
Berserk (activate every time available)
Tiger's Fury (activate every time available)
Rip (keep active)
Rake (keep active)
Shred
Savage Roar (keep active)
Shred (only if all above conditions are met)
Once target is at or below 25% add Ferocious Bite into the mix
Needless to say Feral - Cat is a very complex spec and takes great time to master.
Feral - Cat - AoE Rotation
Feral Charge
Ravage (free due to feral charge)
Savage Roar
Tiger's Fury
Berserk
Swipe (spam)
Feral - Bear - Single Target Rotation
Feral Charge
Faerie Fire
Mangle
Lacerate x 3 (stacks 3 times)
Pulverize
Mangle (whenever possible)
Thrash (if you cannot mangle)
lacerate (if you can not mangle or thrash)
Pulverize (if you get 3 stacks of lacerate or if pulverize is about to expire)
Feral - Bear - AoE Rotation
Thorns
Feral Charge
Swipe
Maul (if glyphed)
Thrash
Maul (if glyphed)
Repeat all except thorns til dead
Restoration - There are many versions of a restoration spec. Your rotation will highly depend on your spec.
Lifebloom (tank only)
Rejuvenation (any raid member taking dmg)
Wild Growth (keep active)
Regrowth (only if spike dmg is being dealt)
Nourish (use to top off anyone affected by your hots)
On a side note you have nature's swiftness and tree of life available if dmg becomes overwhelming.
Thats all for my guide to raiding as a druid.
As stated above these are more guidelines then rules. Feel free to offer feedback for any and all of the options above.
WoW Arena Guides
WoW Leveling Guides
WoW Gold Guides