Welcome back
Without a doubt, HuntersHelper and HuntersHelperUI (
http://fizzwidget.com).
Autobar (can setup actionbars per class)
http://files.wowace.com
These aren't Hunter related, but they're fantastic nontheless
Carbonite Quest
http://www.wowinterface.com/download...niteQuest.html
MetaHud
http://www.wowinterface.com/download...7-MetaHud.html
Mik Scrolling Battle Text
http://www.wowinterface.com/download...attleText.html
HitsMode (gives you another chatbox with all your damage etcetera, much better than the default one)
http://files.wowace.com
Prat (more control over your chatbox)
http://files.wowace.com
Satrina Buff Frames
http://www.wowinterface.com/download...ffFrames2.html
Pitbull (unit frames)
http://files.wowace.com
I'll stop there, otherwise I'll go nuts and list too many lol.