.NET Framework 3.0

.NET 3.0 Framework has made to RTM today and can be downloaded from

http://www.microsoft.com/downloads/details.aspx?familyid=10cc340b-f857-4a14-83f5-25634c3bf043&displaylang=en

Also Microsoft Windows Software Development Kit for Windows Vista and .NET Framework 3.0 Runtime Components

http://www.microsoft.com/downloads/details.aspx?FamilyId=C2B1E300-F358-4523-B479-F53D234CDCCF&displaylang=en