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Order of major side quest progression?
The major side quests in BG2 (by which I mean the ones that give you a stronghold or are otherwise significantly large) are mostly independent of each other, allowing you to virtually do whichever you want in whatever order. That being said, I feel that some of the side quests are more difficult that others. For example, I find the De Arnise Keep and the Druid Grove pretty easy, but the Planar Sphere or the Unseeing Eye quest is significantly harder.
What is your general order of doing all these side quests? Also, do you finish all of a side quest area before heading out to Imoen's rescue, or do you leave the final part of it (like for example, leaving Firkraag or Thaxll'ssillyia or the Druid Grove Rakshasa) for later, after you return? Finally, what about Kangaxx and the Twisted Rune Hideout, before or after Spellhold?