Not much can be said that has not been said already by numerous sages, scholars, and victims of their vicious raids upon the surface.  Links to various resources on the drow have been provided below, but there are a few items of note to state here...

Drow presence in the Aglarond region:

Hosuth - small city of drow
House Tanor'Thal
House Lysaen
Szith Morcane - drow outpost
Maerimydra - regional drow capitol
The Dark Dagger - rogue drow of Vhaeraun
Promenade of Eilistraee - an exiled drow church
DROW RESOURCES

Drow Dictionary
Tales of the Drow
Drow Info
Drow Translator
Drow Pantheon

Available related .pdfs

Drow Magic - Sorcery of Endless Night
The Quintessential Drow
Complete Guide to Drow
Plot & Poison: Guidebook to Drow
Races of Faerun
Underdark
Faiths & Pantheons
There is rumor spreading that with the starshines falling, new truths about the drow have been revealled.  Some of you may have heard that the Skywall, the false ceiling of Azolin, was placed there by the elves millenia ago.  The elves accomplished this by sacrificing the souls of halflings, accounting for their present state.  The drow were the elves who disagreed with the plan, and were subsequently exiled under the earth. 

Be this truth or lies, nothing changes the fact that the drow are responsible for countless atrocities in present-day Azolin.  Whatever their origins, centuries of endless corruption have produced one of the greatest and purest forces for evil on the world.  Despite this, there are accounts of some drow rejecting this culture and acting for good.  The members of the Promenade of Eilistraee are among them, as is the heroic member of Marulama, Balaam Kuu.
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