To get MSH, first navigate to http://beta.microsoft.com and logon using Passport. Then, click where indicated just after the text "If you were issued a guest ID by Microsoft you can sign in" then enter the guest id of mshPDC (this is case sensitive!). You the need to enter your details and you should get beta details back within a couple of days with site access to the MSH bits.

more here: http://channel9.msdn.com/wiki/default.aspx/Channel9.MSHWiki