Can I acquire a duplicate of Planescape Torment electronically from anywhere nowadays?
Edit : As stated by LessPop_MoreFizz, since today (9/28/10 ) you can get Planescape : Torment from GoG. Buy it now!
OLD ANSWER : It's not readily available electronically anywhere. As Daemonic stated, watch on Gog.com. It'll possibly turn up there in the past anywhere else.
In the meanwhile, it's VERY findable on Ebay.