What is New in Visual Studio 2010

1. Debugging Enhancements
1.    Breakpoints 
2.    IntelliTrace 
3.    Parallel Programming and Debugging 
4.    XSLT Profiling and Debugging 
5.    Importing/Exporting Breakpoints 
6.    Importing/Exporting Breakpoints 
7.    Pinned DataTips 
8.    Importing/Exporting Pinned DataTips 
9.    Store IntelliTrace Records In this Directory 
10.    Save IntelliTrace Log from IntelliTrace Window 
2. Deployment Enhancements
1.    Database Deployment 
2.    Web.Config Transformations 
3.    Web.Config Transformations 
4.    New “Publish Web” Dialog 
5.    Web Deployment Packages 
6.    Continuous Integration with Team Build
3. Developer Productivity
1.    Faster Intellisense Support 
2.    Faster Assembly loading in “Add Reference” 
3.    Reference Highlight 
4.    Faster Code Generation 
5.    Box Selection 
6.    Easy Navigation
4. HTML and Java Script code snippets
5. IDE Enhancements
1. Call Hierarchy of Methods
2. A New Quick Search
3. Multi-targeting more accurate
4. The XSD Designer
5. Multi-Monitor Support
6. VS 2010 Extension Manager ·
6. Language Enhancements
1. Introducing Microsoft F#
2. Support for HTML5 specification
7. Platform
1. Multi-targeting Application Development
8. Usability and Developer Comfort
1. Zoom Functionality
2. Detach Window outside IDE
3. Better Toolbox Support

More Details : http://beyondrelational.com/whatisnew/visualstudio/2010/default.aspx