This is a new blog, created a week ago by Alan Meeus , and that is alive at :
Windows Phone for IT pros - Site Home - TechNet Blogshttp://blogs.technet.com/b/windows_phone_for_it_pros/
There is a very good Certificates and Windows Phone 7 explanation, at :
Certificates and Windows Phone 7 - Windows Phone for IT pros - Site Home - TechNet Blogshttp://blogs.technet.com/b/windows_phone_for_it_pros/archive/2010/12/15/certificates-and-windows-phone-7.aspx
In that blog post you can also obtain the link to download the official information from the product team around different corporate scenarios which can be of interest for you and your company.
Great job Alan.