Does any one know about any real application built on asp.net MVC framework. I am not talking about opensource projects as I am pretty much aware of it.
I am more interested in knowing about any commercial website like banking, ecommerce or any other line of business application that's built on this framework.
EDIT: Clarification regarding opensource. I am pretty much aware of opensource projects and they are great. What I am looking for is commercial business application that's made on this framework.
If you visit What is ASP.NET MVC? and scroll to the bottom there is a list of sites that use ASP.NET MVC including stackoverflow.com.
Yes, I have built a commercial "line of business" application on ASP.NET MVC 1.0. We started development on the site when the framework was in beta; and released the site this summer. We are completely happy with our technology choice. Unfortunately I really can't say much more, as my employer would not welcome it.
I'm not sure about the OP's intent; do you mean to get validation of the MVC pattern for very large codebases, i.e. 200 kloc or larger codebases? I can't give you that, and I doubt anyone else really can right now, because there simply hasn't been time to develop so large codebases since the release of ASP.NET MVC. I would suggest researching MVC in Java, as this is probably where you'll find most older & large MVC deployments.
My usual counterargument to the 'very large codebase' fear is you simply shouldn't design so large monolithic apps anymore -- break up the responsibilities and use a SOA architecture to reduce complexity for each individual area of responsibility.
For a webapp on the .NET stack I'd select ASP.NET MVC again with complete confidence. That said, there are many other good choices in webapp frameworks these days.
In here you can easily find top 10 web sites that are built with ASP.NET.