The ASP.NET team has released RTM version of ASP.NET MVC 3. You can download the ASP.NET MVC 3 RTM from here and source code of ASP.NET MVC 3 can download from here. Microsoft has released the following products along with ASP.NET MVC 3.
- IIS Express 7.5
- SQL Server Compact Edition 4
- Web Deploy and Web Farm Framework 2.0
- Orchard 1.0
- WebMatrix 1.0
You can read more details from ScottGu's blog post Announcing release of ASP.NET MVC 3, IIS Express, SQL CE 4, Web Farm Framework, Orchard, WebMatrix .You can upgrade your ASP.NET MVC 2 projects to ASP.NET MVC 3 using MVC 3 Project Upgrade Tool. You can read more details about the MVC 3 Upgrade Tool from here.
Demo Web App using ASP.NET MVC 3 RTM
You can download a demo web app using ASP.NET MVC 3 RTM from here. The demo app is explained in the below blog posts
Developing web apps using ASP.NET MVC 3, Razor and EF Code First - Part 1
Developing web apps using ASP.NET MVC 3, Razor and EF Code First - Part 2