since someone started a guide to leading, how about a guide to being a groupie?
(1) If gname doesn't state OPEN, best to ask if you can join, it's only polite
(2) Turn off looters, as leaders are usually in charge of looting
(3) Pay attention to instructions from leaders, especially instructions on mobs that require different styles of killing.
(4) cut down the spam, unless you're regenning.
-- spam makes the leaders's screen scroll, and he could miss vital information like ppl getting hit by aggro mobs while running, pthieves, etc.
(5) Inform the leader if u have to be afk, and try not to be afk mid-fight.
(6) NEVER recall midfight, even if u're dying, unless asked to do so by the leader. Most people have triggers to fix prots when their protected one dies, but i doubt anyone has a trigger to fix prots when their protected one recalls (maybe we should start haing one now.) and this could mean a massive CF....i've seen it in my groups before.
(7) Avoid recalling mid-run or in a haste, unless you REALLY REALLY have to go NOW. Try to give leader ample notice, eg. "I have to go after this kill." so the leader can take some time to sort out protects/healo/etc.
(7) Make suggestions, not demands.
--- remember that the leader has last say on areas/xp or eq, etc. most of the time the leader would ask for general concensus, but no leader likes a backseat leader in the group who tells him what he should or should not do (unless the leader is a clueless moron...in that case, join another group.)
example of a suggestion: "Mind if I get the token if it pops?"
example of a demand: "If token pops, all turn off looters please, it's mine"
(8) Try not to antagonize the leader as it can be pretty stressful keeping track of 10 or so ppl in a group, trying to keep them all alive and making sure ppl are ready for battle, etc.
hope this helps...do add more if u think there should be more added