Today there is no build in support for SharePoint found inside Visual Studio 2008 except the SharePoint workflow project. If you want to create studd like Site Definition etc. you need to download the Windows SharePoint Services 3.0 Tools for Visual Studio. It is available for VS2005 as well as VS2008. So in TechEd EMEA 2008, Microsoft announced that Visual Studio 2010 tools for SharePoint will be build in for VS2010.
Channel 9 did an interview with Reza Chrisaz on what are the new features in VS2010 for SharePoint developers. You can download the video here. I list down some of Reza’s Key callouts
Adding Solution to TFS source control with Team Build and nightly build support