Microsoft has launched 6 new products for web developpers. A wide set of tools from WebMatrix (complete and simple tool to develop and publish a website), to advanced libraries like ASP.NET MVC3 and NuGet.
To have more info about this, just follow the Scott Guthrie's blog : Announcing release of ASP.NET MVC 3, IIS Express, SQL CE 4, Web Farm Framework, Orchard, WebMatrix