In no particular order:

• Even though dungeons become available at level 15, tanks don’t get most of their good threat-generating abilities until later than that. If your tank is level 20 or below, she probably won’t be able to hold more than a few mobs at once, and will have difficulty pulling mobs off multiple people.
• Along the same lines: focused fire is your friend. Yes, AOE is awesome and boosts you up the DPS charts like single-target spells never will. But if you’re AOEing mobs, you’re competing with the tank on the threat meter for all of those mobs. And see above: low-level tanks don’t always have the AOE threat abilities that they will at higher levels, so you’re far more likely to peel a mob off the tank if the tank’s under level 20 or so.
• Your healer needs mana. Mana regeneration in heroic-level instances is so high that yes, it’s possible to blow through an entire instance without stopping to drink. In low-level instances, though, healers are often starved for mana – especially if they haven’t been running instances constantly and aren’t entirely in blues. The default party interface shows you your partymates’ mana levels. (If you have a custom interface that doesn’t show them, get rid of it or mod it so it does.) Pay attention to those levels. Don’t pull the boss when the healer’s at 25% mana, or you’ll end up with a dead group and an angry healer.
• Sometimes people want to do all the bosses. That’s okay. It means more XP for you. If you’re XP-locked, it means more chances at loot for you. Don’t whine about not going straight to Amennar the Coldbringer; you’ll get there eventually. Pouting and dropping group – or doing nothing and getting votekicked – and getting the deserter debuff would probably take as much time as just doing the damn bosses anyway.
• Nobody really cares how much DPS you’re doing as long as you’re taking the mobs and bosses down. Put your Recount back in your pants.
• Complaining that a member of the group really sucks is more likely to get you votekicked than them. Just saying.
• Remember that itemization kind of sucks pre-70. Yes, you really wanted that cloth caster belt for your warlock. But there isn’t anything better in leather for the shaman healer at that level, and she wanted it too. Just because there’s a “better” armor class that a character can wear doesn’t mean that the “lesser” armor class doesn’t have the better gear for her.
• You’re not expected to know the ins and outs of everybody’s class, but don’t assume that everybody has the same abilities as they would at 80. People asking the level 35 priest “lol if u shadow den y no shadowform”*: this means you.
• The Satchel of Helpful Goods that you get at the end of the instance does its best to adhere to your ideal armor class, but other than that, it’s not very good at giving you useful gear. We’ve been doing the Dungeon Finder for 20 levels now. We know the Satchel gear kind of sucks.

* Direct quote. From someone whose main was a “rading shadow preist”. Someone asked for an Armory link and he dropped group.

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