1) Using @ for variable that are keyword.
var @object = new object();
var @string = "";
var @if = IpsoFacto();
2) Aliased Generics.
using ASimpleName = Dictionary<string, Dictionary<string, List<string>>>;
Allows you to ASimpleName,instead of
Dictionary<string, Dictionary<string, List<string>>>;
Use it when you would use the same generic big long complex thing in a lot of places.