Optional Parameters and Named Arguments in C# 4 (and a cool scenario w/ ASP.NET MVC 2)

[In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu]
This is the seventeenth in a series of blog posts I'm doing on the upcoming VS 2010 and .NET 4 release.
Today's post covers two new language feature being added to C# 4.0 - optional parameters and named arguments - as well as a cool way you can take advantage of optional parameters (both in VB and C#) with ASP.NET MVC 2.
Optional Parameters in C# 4.0 C# 4.0 now supports using optional parameters with methods, constructors, and indexers (note: VB has supported optional parameters for awhile).
Parameters are optional when a default value is specified as part of a declaration.  For example, ...