First off, good job, Sin.
Couple of things I would add:
1.) If you have a set of instructions you need to give every new group, go ahead and make a hotkey to save time. ("When I say I'm ROOTING, everyone stop swinging and run a big circle, or we will all die!" "If we draw more than 3 mobs here, fall back to my position and I will evac us all." "If you want PoT, just hail me." etc.) Don't assume people know what to do. Unfortunately, many people have high-end characters without the least clue how to play them and it could get your group killed without clarification ahead of time.
2.) When orginizing how loot will be divided, be courteous and only pick one crafting style for right now. Unfortunately some people can only make money off gems and rares, especially when all the other drops are stackable. Don't start by saying, "The tank gets the stax, and I craft weapons, jewels, and armor, so I get all of those. You two can fight over the tailoring gems."
3.) Rogues (and it pains me to say this), you first concern should be as a DD, your second as a businessperson. Make sure your tank isn't suffering undue repairs costs because you're pickpocketing instead of crit-ing. I'm not saying stop picking pockets, just make sure the group finances don't suffer because the mob is getting in another 8 swings when he should've been dead already.
4.) If you have to ding-and-dash, please tell someone. (This was mentioned before but it bears repeating) Okay, we all do it at somepoint or another. We've all stayed up past our bedtime, or held off getting ready for work for ten minutes to ding. But I'm just amazed at how many people get a connection problem right after the amount of xp I earned dropped. Someone may be trying to do the same and all they need is another 4 kills before they ding and the whole group can disband and lead their separate lives.
5.) Conversely, don't guilt someone into staying in your group if you got a while before you reach your next milestone. If, you're 48 and you need one more yellow before your epic and someone needs to leave to go take the kids to the hospital or whatever, let them go. I've seen that last yellow sometimes take days. Same goes for your 1500th cm, that can take months, don't make them hang around if they need to make dinner.
*****PET PEEVE: If you're guilting everyone into staying because you got two more pinks before your path quest and you just absolutely need this today, TURN OFF YOUR CMs!!! That's just common courtesy and unfortunately I've been in many groups where I've earned a yellow in the amount of time it took the guy lower in level than me to ding with only a half pink to go.
Ultimately, common sense will get you through the video game. Courtesy will get you far in the society.
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Avatari - 41 Erudite Paladin - PPO
Venomstorm - 41 Dark Elf Rogue - PPO
Crushendo - 23 Elf Bard - PPO (Retired)
Gungnir - 25 Barbarian Warrior - PPO
Arctic - 19 Human Druid - PPO
Thalasala - 30 Elf Druid - Hdstck
Arrowstorm - 17 Elf Ranger - MF
Mirrorsteel - 20 Human Enchanter - MF
"Don't worry, %4. I here the headless look is in."