For all of you guys who love the concept of Digg/Pligg and want to stay on top of the latest Microsoft technologies you may be interested in
Kigg. Kigg is a combination of Digg + DotNetKicks built using ASP.NET MVC, LINQ, and ASP.NET AJAX. ASP.NET MVC is one of the latest things Microsoft has been working on that uses the same concepts you'd find in Ruby on Rails and several PHP frameworks like CodeIgniter
It's a freely available project you can download here
Demo: http://kigg.dotnetslackers.com/Default.aspx