In case you haven't noticed already, the RTM of .NET 3 is finally available. 

Runtime: http://go.microsoft.com/fwlink/?LinkId=70848

SDK: http://download.microsoft.com/download/1/b/3/1b3f749d-e215-482c-a004-5d9c26c75c92/6.0.6000.0.0.WindowsSDK_Vista_rtm.DVD.Rel.img

Visual Studio Extensions: http://www.microsoft.com/downloads/details.aspx?FamilyId=F54F5537-CC86-4BF5-AE44-F5A1E805680D&displaylang=en

Workflow Designer: http://www.microsoft.com/downloads/details.aspx?FamilyId=5D61409E-1FA3-48CF-8023-E8F38E709BA6&displaylang=en