Quick thought for some of the multi-part quests:
I have seen WAY too many times that someone will forget to advance the quest properly and end up completing at least one more part before realizing the error. This usually puts the rest of the group in a bad position - either redo the quest you just finished, or continue on knowing that one of your members isn't getting the full benefit. And yes, I always remind people to speak with the NPCs, etc., but it doesn't always work.
One option to fix this: a warning or reminder when you attempt to zone into a quest that basically says you aren't actually on it. I can see this getting annoying at times, but I think it is worth it. This could be applied to just multi-part quests, but I'd like to see it for all of them.
Thoughts?