Phew. Remember all that stuff about GTA IV and Games for Windows Live? And how the press release kept dropping words like "exclusive" and "Games for Windows - LIVE" uncomfortably close to each other? It's OK. The game isn't exclusive, either to Microsoft's GFW brand or Games for Windows - LIVE service. It's just appearing there first. A listing for Grand Theft Auto IV has since appeared on Steam, with a release date of December 3. A short delay, yes, but one that's probably all too worth it for those in the pro-Steam, anti-GFW-LIVE camp.
Grand Theft Auto IV [Steam]