Good news: WIF was released today!
Bad news: it requires Windows 7 or Windows Server 2008...
Get it here and the SDK here.
If you just want to know what it is, read this.
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Ne ho già parlato qui . E’ ora possibile scaricare il runtime , previa registrazione, e l’ sdk . fonte
W2k3 support soon :). social.msdn.microsoft.com/.../515f2bc6-9b8e-4f59-9201-9b6743da218d