I was going to write something up for the ASP.NET MVC Framework today, but thankfully I checked my feeds before I did that. Turns out that Scott Guthrie has already done this and did it much better than I would have done it. Its a massive post, but very detailed and should give you a good feel what the framework is about.

Just some key points to summarise in case you can't be bothered or don't have time to read the whole post

• New model for building web sites
• No post back (that's right ... no forms, no nothing)
• Simple HTML outputed; the rendering engine doesn't really need to be ASP.NET for the framework to work
• No need for complex server side controls such as GridView (because there is no post back) 
• Very modular, almost everything can be extended/replaced
• Could use AJAX with it, but not much point
• Everything is driven off the URL which dictates what action will be performed by the "Controller"
• With the logic being encapulated in the "Controller" testing can reach ~100% code coverage simply with unit tests without using web test automation applications