Instance: Naxxramas 10-man Spiderwing, Anub'Rekhan, Grand Widow Faerlina and Maexxna
Box: 4x elemental shaman
Gear level: level 80 blue gear
Difficulty: Easy from a boxing perspective.
Guide:

Anub'Rekhan
Upon entering the room, the tank tanks him where he stands, the raid spreads out in a half circle around it. Every now and then, when the boss casts Locust, everyone has to run to the left side of the room while the tank kites the boss on the edge on the right side and tanks on the other side after that. This goes back and forth some times, all the while adds spawn, two types, sometimes an elite, or waves of small ones from corpses of the elites.

From a multiboxing perspective, it is best to already circle at the side people will run too when locust. This way you minimize downtime on positioning and repositioning. However, when the tank kites the boss, you dont need to be spread out for a while, deal with adds away from the boss if possible, on the other side when going back on the boss spread out again. I healed the offtank on adds too so I made sure I didn't burn my mana by nuking. This is a long fight and pretty easy to see through it all. Fairly easy boss.

Grand Widow Faerlina
The easiest boss in Spiderwing, very easy to multibox through it. Basicly she starts with 4 adds. Every now and then she enrages and you need to kill an add straight away to remove the enrage. Every now and then she does a reign of fire, but for one, it doesn't do much damage at all. It's still better if you are spread out a bit, but not undoable by just moving out of the reing of fires while having alts on follow either. The reign of fire isn't problematic enough to really worry to much over. So when the boss enrages, quickly kill an add, they die quickly.

Maexxna
She does do some annoying things. But as an elemental shaman boxer there was quite a lot I could do extra. Basicly upto 30% you should take it easy, make sure you will have a lot of mana left when she gets to 30%, don't dps much, you don't really need to this phase. The hard part will be from 30% to 0%. We had the two other dps classes deal with the cocoons. It was a bit overkill for me to worry about them, the cocoons only have 5k hp and having 4 dps classes focus on killing cocoons shouldn't be needed. When one of your chars is cocooned, just individualy move them back to your group. Use Thunderstorms when the adds are around you only, they dont do much dps but can still annoy healers and casters a bit, but you should need to waste extra mana by using fire totems either. We had a mage that threw in some aoe's when mine was on cd.

At all times be ready to help heal the tank. If the web cc is coming and tank is low, throw 4 lesser healing wave on the tank. Actually, whenever the tank gets too low, help healing. It could very well be that one healer just got cocooned at a critical time. It'll be your job to make sure the tank wont die then.

You should use mana spring totems this fight and not poison cleansing. To dispell the tank, just make a macro that does a [target=targettarget] Cure Poison for your main, and whenever needed, cure the tank. This is important as the poison is a 90% healing debuff. It might be a good thing to have a seperate person also work on curing the poisons, or either two of your shamans. I found the latter somewhat problematic however since I sometimes needed to stop a cast to cure poison, and my cure poison macro wasnt made for that so I had to stop cast on all shamans to do so. There's macro ways around this however which I'll have in place next time. But yes, two people on dispelling the poison, just because one might get cocooned.

30% to 0% she goes enrage. We wiped twice here, well dont bring a crittable tank then, I know, working on gearing him up. :P We finally managed to do it by just nuking the boss and I often helped throw some heals too, made sure I was 80% mana so I could spam the shit out of maexxna. And we just barely made it, as the tank almost nearly died twice. But mmh, might want to bring a tank with at least 30k hp to this fight, as well as uncrittable ofcourse. Doable without, as we proven, but you'll need some luck. :P

Other wings will come in due time as I'll do them, for now however my guild decided to wait a few days and gear our MT up first a bit.