Been a while since I read Salvatore, but if memory serves he did the Icewind Dale trilogy before the Dark Elf Trilogy. Drizzt turned into such a popular character that he felt the need to do the Dark Elf series to fill in the back story of Drizzt's life. If you want to start reading the rest of Salvatore, start with the Icewind Dale stuff and move along from there. They're vaguely chronological and will often reference things that happened in earlier books, so it's best to read them in order.