I played a campaign back in D&D 3.5 which I dealt with the death of Lolth, but upon googling for it I learned that it was just about the silence of Lolth which has already been mentioned. Suffice to say it created a lot of unrest in drow society, with cults of lesser known drow deities vying for greater influence. I expect the book series mentioned earlier goes into this in some detail too.