PC Tools
http://nwvault.ign.com/View.php?view=NW ... ail&id=132

Significantly improves roleplaying in-game.
Truly a must have.
Tintable Clothing Compilation pack | 1.2
http://nwvault.ign.com/View.php?view=NW ... 55534&id=2

This hak allows previously untintable regions of armor to be tinted.
Tested and works well.
Highly recommended.
Coat of Arms
http://nwvault.ign.com/View.php?view=NW ... tail&id=80

Plenty of Faerunian insignia to use, as well as traditional chivalric. Well worth it. It's a bunch of overide files only, so not sure if it can be hackified.
Tested as overide and it works.
Recommended.
NWN2 Silver Weapons
http://nwvault.ign.com/View.php?view=NW ... ail&id=146

Really useful hak that recolors the standard gray of steel to a much brighter white. It's a gift for the particular weapon crafters, allowing much greater attention to detail.
Tested as a hak and it works well.
Highly recommended.
Shirtless Saga Armor Pack, Volume 1 & 2
Really popular haks with great variey, if you're a bloke. Until there are female versions I see this hak as unfinished and unbalancing for ALFA.
Item Placeables
http://nwvault.ign.com/View.php?view=NW ... ail&id=153

The NWN1 hak was better...it simply allowed the item to appear as an item on the ground instead of a sack. This one uses placeables instead. Still, it's better than a sack.
Good, but not vital.
Paintings x 2 sets
http://nwvault.ign.com/View.php?view=NW ... ail&id=152
http://nwvault.ign.com/View.php?view=NW ... ail&id=151
I find the armor and weapon choices Obsidian provided more than adequate. Extra tinting options for both are welcome however and I'd love to see them included. PC Tools is vital imo, the paintings and placeable items would be a boon, and the coats of arms important for soldiery.
And that's all I've time for.