For those who are still playing Tron 2.0, the long-awaited Killer App Mod
was released yesterday. In a nutshell, it's essentially a massive patch/restoration/graphics enhancement mod, providing widescreen support, windowed mode, new multiplayer options, etc. It's the mod to end all mods, and should be considered a prerequisite for anyone playing Tron 2.0, veteran or novice.
Be sure that you also have the Unofficial Patch
installed first, though.