.NET Framework 3.0 contains WCF, WPF and WWF. It is shipped !  http://www.microsoft.com/downloads/details.aspx?FamilyId=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en.

The Windows SDK for Windows Vista and .NET Framework 3.0 can be downloaded from http://www.microsoft.com/downloads/details.aspx?FamilyId=C2B1E300-F358-4523-B479-F53D234CDCCF&displaylang=en.