ASP.NET MVC discards the WebForm model normally associated with ASP.NET. In its place is the Model, View, Controller framework so popular in the open source community.
Meanwhile IronRuby, Microsoft's Ruby implementation, is one of the four languages spear-heading the Dynamic Language Runtime. Ruby was chosen for its dynamic features and the surprisingly successful Ruby on Rails. It is joined by IronPython, a new version of JScript.NET, and a rarely discussed version of Visual Basic.
During Tech Ed, John Lam demonstrated Microsoft's current progress with both by showing a simple database-backed website built using a few lines of IronRuby. The demo wasn't perfect, part of the data model had to be written in C#. Notes and a copy of the sample can be found on John Lam's blog.