I used to play D&D, AD&D, AD&D 2ed. Haven't played past that. However, there were two feats that every character i made had to have. I'm not sure if they're in 3rd edition or not. The first feat is/was:
Blind Fighting
IIRC, that feat reduced your - to hit from being blind from -4 to -2. I also "remember" that there was Improved blind fighting, which further reduced that to no penalty. With all the Blindness spells being tossed around, Sleet storm, Darkness, Obscuring Mist etc.... this could be a viable feat.
Feat 2:
Ambidexterity (sp?)
Reduced penalties from two weapon use to -0 for main hand and -1 (or -2) for off hand. No need to quantify this feat.