Visual Studio 2010 has a good feature called IntelliSense which relives the pain of developers of remembering namespaces, classes and the methods in those classes.
When developing HTML 5 sites CSS3 , HTML 5, SVG(Scalable Vector Graphics) are used to create cool HTML5 Websites.
Visual Studio Gallery provides tools to be plugged in Visual Studio 2010 and start development in HTML5.
CSS 3 IntelliSense for Visual Studio 2010.
HTML 5 IntelliSense for Visual Studio 2010 and Visual Studio 2008
SVG IntelliSense plugin for Visual Studio 2010 and 2008.
Go ahead and add these tools to Visual Studio 2010 and make your life happy by easy coding