I use ThorUI auto updater. The only real gripe I have about it is that it automatically splits your chat channels up into a number of tabs which I find to be an absolute pain in the *****
EQ2 map is nails, no one should be without it.
ACT combat tracker is a great parser. Not necessary but it can give you an idea where you are DPS wise and you can figure out where to pick it up. Also if you raid it can time out aoe and such.
Not really the selection available for WoW but since EQ2's UI is so customizable already it isn't much of an issue.
Edit - Teamspeak/Ventrilo. Not a mod but it is great to have, I used to be against it since it killed the vibe to have Grimthor the Troll Warrior talking to you in a pitchy teenage voice. However I have since fallen in love with it since actually being able to hold a real time conversation with someone you have played with for years is awesome, really builds on community of the guild.
Edited, Jul 9th 2007 9:37am by bodhisattva
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Bode - 100 Holy Paladin - Lightbringer