Ms. Splosion Man on Steam moves away from the dying GFWL to Steamworks today. Also, it’s on sale 75% off for the Steam Summer Sale (yeah, they spilled the beans).
When I upgraded to Windows 8, I had issues upon starting known Games for Windows LIVE games, the overlay would not start. Therefore, effectively locking me out of my games by not being able to access my (online) profile. The game saves were still on my system that I copied over, but due to some incompatibilities with GFWL and Windows 8, would not allow me to play them.