The overload of POIs on the map is a problem many of us are familiar with. Rothgar (EQ2's lead programmer) had the idea for us to be able to tie POIs to quests (so that they only show up when you are looking at the relevent quests). To my knowledge this is on the "Want to do when we have time" kind of list, I haven't heard anything from Rothgar to late.
But anyhoo, we currently cannot sort them beyond sorting by type (zone, quest, etc.) -- which isn't always helpful given that many POIs are incorrectly typed.
What you can do is use the search bar to try and find the POIs you need. Beyond that I recommend EQ2i (eq2.wikia.com) as a great source for quest information (and it's a wiki that anyone can edit if you find something missing or incorrect). Some UIs (Fetish Nightfall and ProfitUI come to mind) even have buttons that open the browser to EQ2i (or other sites) for the quest in your quest helper window.
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