JPN Silverlight 3 SDK is released at http://www.microsoft.com/downloads/details.aspx?displaylang=ja&FamilyID=2050e580-f1d5-4040-bb09-e6185591b6b5

JPN Silverlight 3Tools is released at http://www.microsoft.com/downloads/details.aspx?displaylang=ja&FamilyID=9442b0f2-7465-417a-88f3-5e7b5409e9dd

Users can install JPN SDK and SLTools on top of JPN Visual Studio 2008 + SP1 and create Silverlight apps. The skus' that they can be installed on are VSTS, Pro, STD.