Why should move to Visual Studio 2010

• Built-in tools for Windows 7, including multitouch and "ribbon" UI components
• Rich, new editor with built-in Windows Presentation Foundation (WPF)
• Multimonitor support
• New Quick Search, which helps to find relevant results with intellisense support
• Great support for developing and deploying Microsoft Office 2010, SharePoint 2010, and Windows Azure applications
• Multicore development support that allow to parallelize applications and a new specialized debugger to help to track the tasks and threads
• Improvements to the ASP.NET AJAX framework, core JavaScript IntelliSense support, and the inclusion in Visual Studio 2010 of JQuery, the open-source library for DOM interactions
• Multitargeting/multiframework support
• Support for developing WPF and Silverlight applications with enhanced drag-and-drop support and data binding
• Featured support for Team Foundation Server (TFS) 2010 (and previous versions) using Team Explorer
• Integrated support for test-driven development

For more information :

http://msdn.microsoft.com/en-us/library/dd547188(VS.100).aspx

http://msdn.microsoft.com/en-us/library/bb386063(VS.100).aspx