Instance: Vault of Archavon
Box: 4x elemental shaman
Gear level: pre-heroic blues/heroic blues
Difficulty: Smooth, no deaths, but still annoying.
Guide:

Adds make the roof cave in and you have to move out of it. Don't pull two trash mobs, we did once, and we barely had a place to stand as almost everything started caving in. :P Could be troublesome that way so better to do one by one.

Archavon
He's quite a tank and spank like boss, he does two abilities of concern. He throws rocky spikey stuff at someone doing 200-300 damage per spike, it's a lot of spikes tho. But not too troublesome. As well as some cloud where you have to move out off. Ideally it is best to spread out for this fight. I hardly did myself tho, I chainhealed myself up when I got damaged and that seemed to do fine too. The place if a bit small and it was annoying to reposition. Still, next time I'll know how the fight goes and will try positioning right from the start so I can more easily spread out to minimize damage on the raid. Other then this all, he is easy loot.