The xUnit .Net codeplex page lists one useful Visual Studio code snippet for creating a Fact. As you can tell I am fairly fond of code snippets so I created a few more which I use when writing xUnit.net facts. These are one line snippets that I find very convenient when writing my assertions.
Below is a table which shows the shortcut you use to access the snippet and the code the snippet generates
I have included a zip containing these snippets. Enjoy!