Instance: Obsidian Sanctum
Box: 4x Elemental Shaman
Gear level: Pre-heroic blues/Heroic gear
Difficulty: Smooth, no one died, neither on any of the drakes.
Guide:

Trash packs are easy, the packs of two big Dragonkins are simply tank and spank. The other packs you have to run out of reign of fires as well as move away from orbs, however if you go max range, doubt you will nitice the orbs. Both types of trash packs are fairly simple.

Left side drake (I forgot the names )
2 dps a tank and a healer go into the portal he spawns to deal with the add. You as a 4-boxer should not be one of them. Keep on the boss, spread out and have individual movement keys to move out of the rings he spawns, if you stay in to long you get a fair bit of damage. However, this is perfectly healable by yourself as well and happens in intervals. So make sure the healer that stays on the boss just focuses on the tank and not on you. From your point of view is pretty tank and spank then.

Far side drake
This is exactly the same tactic for you as last, however now only a tank and a healer go into the portal on aoe tank adds, no need to kill the adds apparantly. Spread out, ove out of the red circles.

Right side drake
Wee, portal fun! Everyone but a tank and a healer have to go into the portal to rape the add in the portal, this means you too! It's hardly problematic tho. Position yourself close to the portal to begin with. Wen on the boss it is again spread out and move out of the red circles, exactly the same as the other drakes. And in the portal is a tank and spank add. If you find yourself far from the portal the first time because you didn't know where it spawns (it spawns slightly on the entrance side of the boss by the way) just use ghost wolf form.

Sartharion
This is a remarkably easy boss, especially for when having a multiboxer. When wall of flames appear, move to the center of the two walls. Don't take the wall, someone in my raid did once and he needed tons of healing to live. If you would get it on all four it will probably be a wipe, even if you chainheal through it. It's like a bwl shadowflame dot kinda thing it seems. Anyhow it is perfectly avoidable. Occasionally adds spawn, just gib the adds and continue on the boss, tactics on wowhead said to aoe the adds, I found single target dps as a shaman is more effective as they die quickly. If there are spawning a bit more then maybe AoE.

At 10% he will spawn a ton of adds. Loads. Make sure you have Elemental Mastery and Thunderstorm cd's up for this part, start single target dpsing them using chain lightning the first few secs of the spawns until you are certain they all spawned, and BOOM, drop earth elementals if the raid is getting too much to handle, although I found they do little damage and we didn't have too much trouble with it, finish off the boss and grats to my first 22 slot bag! Nothing else of interest dropped. :<