Retrospective by Kieron Gillen (Rock, Paper, Shotgun)
More lengthy, academic analysis of the game:
Carr, Dianne (2003) Genre and Affect in Silent Hill and Planescape Torment
Game Studies 3(1) ISSN:1604-7982
The PC game has been re-released on the occasion of its 10th anniversary. However, you'll probably need to install the fixpack to run it successfully on XP or Vista.
Planescape: Torment has been released on GOG.com
It is their second most-requested game title.
GemRB Game Engine
open source re-implementation of BioWare's Infinity engine, 1998-2002