LINQ Support :
This is the composition of many standard query operators.They are significantly used in compile time checking and debug step by step through queries.
Expression blend support :
This XAML generator for Silver-light applications, this is a embedded plug in for .NET 2008.
Windows Presentation Foundation :
This is the extensive graphic functionality.It contains WPF foundation library templates.By this one can develop 2D and 3D applications.
Multi targeting supports :
Earlier the .NET 1.1 applications are not able to work in Visual studio 2005 applications.Now we can able to create ,develop and debug .NET 2.0 and 3.0 and 3.5 applications. we can also deploy .NET 2.0 applications in the machines which contains only .NET 2.0 not .NET 3.x.
Previously developer has to install AJAX control library separately that does not come from VS, but now if we install Visual Studio 2008, we can built-in AJAX control library. This Ajax Library contains plenty of rich AJAX controls like Menu, TreeView, webparts and also these components support JSON and VS 2008 contains in built ASP.NET AJAX Control Extenders.
Nested Master Page :
Already Visual Studio 2005 supports nested master pages concept with .NET 2.0, but the problem with this Visual Studio 2005 that pages based on nested masters cannot be edited using WYSIWYG web designer. But now in VS 2008 we can even edit the nested master pages.
Organize Imports or Usings
This removes unnecessary namespaces .
we can select all the namespaces and right click on it, then we can get context menu with Organize imports options like "Remove Unused Usings", "Sort Usings", "Remove and Sort".
Refactoring support for new .NET 3.x features like Anonymous types, Extension Methods, Lambda Expressions.
Intellisense Filtering :
Earlier in VS2005 when we were typing with intellisense box, all the items were displayed, but now in this .NET 2008 when we press k, only the items starting in the letter k is displayed.
Intellisense box display position :
Earlier in some cases when we were typing the an object name and pressing . (period) then intellisense was being displayed in the position of the object which we have typed. Here the code which we type will go back to the dropdown, in this case sometimes programmer may disturb to what he was typing. Now in VS 2008 If you hold the Ctrl key while the intellisense is dropping down then intellisense box will become semi-transparent mode.
VS2008 split view :
VS 2005 has a feature show both design and source code in single window. but both the windows tiles horizontally. In VS 2008 we can configure this split view feature to vertically, this allows developers to use maximum screen on laptops and wide-screen monitors.
Debugging .NET Framework Library Source Code:
we can debug the source .NET framework library methods.
Lets say If we want to debug the DataBind() method of DataGrid control we can place a debugging point over there and continue with debug the source code of DataBind() method.
In built Silverlight Library :
Earlier we used to install silverlight SDK separately, Now in VS 2008 it is inbuilt, with this we can create, debug and deploy the silverlight applications
Visual Studio LINQ Designer :
Already we know in VS 2005 we have inbuilt SQL Server IDE feature. by this we no need to use any other tools like SQL Server Query Analyzer and SQL Server Enterprise Manger. we have directly database explorer by this we can create connections to your database and we can view the tables and stored procedures in VS IDE itself. But now in VS 2008 it has View Designer window capability with LINQ-to-SQL.
Inbuilt C++ SDK :
Earlier It was so difficult to download and configure the C++ SDK Libraries and tools for developing windows based applications. Now it is inbuilt with VS 2008 and configurable
Multilingual User Interface Architecture - MUI :
MUI is an architecture contains packages from Microsoft Windows and Microsoft Office libraries. This supports the user to change the text language display as he wish.
Visual Studio is now in English, Spanish, French, German, Italian, Chinese Simplified, Chinese Traditional, Japanese, and Korean.
Microsoft Popfly Support :
Microsoft Popfly explorer is an add-on to VS 2008, by this directly we can deploy or hosting the Silverlight applications and Marshup objects
Free Tools and Resources :
VS 2008 provides plenty of free tools and resources with the demo version tool kit.
We can use for Commercial :
Earlier we were spending lot of money to host our .NET applications for commercial use. Now we dont need to worry Now Microsoft is providing us to host our application free on Popfly for web pages and also visual studio express projects.