Last week we shipped Service Pack 1 of Visual Studio 2010 and the Visual Studio Express Tools.
In addition to bug fixes and performance improvements, SP1 includes a number of feature enhancements. This includes improved local help support, IntelliTrace support for 64-bit applications and SharePoint, built-in Silverlight 4 Tooling support in the box, unit testing support when targeting .NET 3.5, a new performance wizard for Silverlight, IIS Express and SQL CE Tooling support for web projects, HTML5 Intellisense for ASP.NET, and more.