First Looks: Visual Studio 2010 tooling for SharePoint
Via Soma:
Sharepoint tools support in Visual Studio
http://blogs.msdn.com/somasegar/archive/2009/02/19/sharepoint-tools-support-in-visual-studio.aspx
In the screenshots, note the .package and
.feature files, as well as the Packaging Explorer tab on the
right. In the example a feature is displayed where there are
several elements available in the solution (left), with just
the workflow features being selected into
“Workflows.feature” (right).