Games are probably one of the best examples of "consumer software". I'm constantly being asked "what commercial products that are shipping are using .NET?". I'm sure you've heard similar questions. Well, if you've been reading along, you'd have noticed that I've been having to re-install a lot of software since I'm making the x64 jump. While doing so, I've noticed that *all* of the games I've installed so far (albiet, only 3 of them), every one of them utilizes .NET. Here is a list:
Lord of the Rings Online
Uses .NET 2.0 for it's launcher / updater application.
Dungeons & Dragons Online: Stormreach
Uses .NET 1.1 for it's launcher / updater application (the game is a year and a half old afterall).
Neverwinter Nights 2
I know that Neverwinter Nights "designer" application (the one that allows you to create content for the game) is written in C# and utilizes .NET 2.0. I'm not sure if any of the other components utilize .NET or not.
Nonetheless, this list contains *real* examples of commercial (targetted at consumers) applications taking advantage of .NET. Are you aware of any other games? If so, leave a comment.