What the Hell can .Net do exactly?

What's an example of a possible application that can be made with .Net?

What's a current example of an application using .Net?

As someone who likes both Java and C#, I have to say C# has a lot more niceties.  You have property support built into the language, for example, instead of having to call getter and setter methods.  You can write your own operations.  You have indexers for convenience, and the index doesn't even have to be an integer.  Ref and out variables for easy working with object references.  You actually mark methods virtual and overridden instead of losing performance on all of them.  In general marking up works better, there have been cases in Java when I've been forced to make classes into singletons just because inheritance is screwed up for static classes. 

It's very easy to learn C# if you are a Java person so you might as well take a look.  Only regret I have is that VisualStudio lacks the refactoring capabilities of Eclipse.