I did the NPCs' quests before the entering the Underdark, the only major quests I didn't do yet were the Unseeing Eye quest and Umar Hill... ...
Kangaxx was a minor sub-quest done in Chap 6 too.
Let's see, I screwed the Noble harassing Nalia, Jaheira got her Harper Pin, Keldorn went back to his family, helped Korgan kill the thieves who 'stole' the book he was looking for, finished the Planar Prison sub-quest, had fun with the Twisted Rune, found the Gem in the chicken in Umar Hill, bought weapons and ale for the Umar Hill kids, Anomen passed his knighthood test, Edwin became Edwina and later transformed back to male and killed his benefactor, rescued Cernd's kid and left the kid in the Druids' care, solved the Tradesmeet Crisis with the Shadow Druids and the Genies, gave the acorns to the Nymph Queen, did all the Paladin sub-quests, the last being killing Firkragg, solved the mystery of Umar Hills, looted the J~~~~ guild in the Drow City, hmmmm... ... I think I'm getting too long.
Basically, the only quest I know I didn't do, is the Limited Wish quest. Definitely the only one.
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If not a Sorcerer, then a Paladin.
