I think it would be thematic (shamelessly) to have Grove Spiders showing in areas like the Shroomstalk Forest and Moldmire. Maybe even in the Hidden Pond.
Not exactly on the same subject, but still on the idea of making they more common, maybe it'd be interesting to see some old style spiders (//%22http://www.efupw.com/old_forums/viewtopic.php?t=36649&highlight=spider%22) coming back to the scene?
- Bloated Sack Spider - natural, but bred to be fat and weak (sort of like a domesticated spider)
- Fungus Spider (I bet this was the old name for Grove Spider?)- Mostly natural, but over time their exposure to crazy Underdark mushrooms have given them strange powers
- Mutant Spider (are they still around?) - mutated breed of spiders, caused by *spoiler*. Some radical druids may encourage them, many others wouldn't
- Hunting Spider (we still have this one) - natural for the Underdark
- Racing Spider (we still have this one) - bred by the drow for extreme speed, then went feral and is now a common predator in the UD
- Skull Spider (I think we've seen this one once) - natural
- Traensyrian Guardian Spider - specially bred/enhanced by the magic of lolth
- Underdark Behemoth Spider (we got it) - the origin of this creature, and indeed most things about it other than the fact they exist, is unknown unless discovered IG
- Underdark Dire Spider (we got it) - a dire spider that lives in the UD