Visual Studio 2008 and .NET framework released by the Microsoft recent days.It has lots of new features compare to it's prior version.
With asp.net 3.5 you can now develop web application as you are developing desktop application. You can give functionality to asp.net web application just like desktop with lots of new technologies with .net framework 3.5.
I have found a great link form where you can download asp.net 3.5 and visual studio 2008.
Here is the link: