Centro much like Small business server(code named cougar) is a bundle of several Microsoft technologies namely Longhorn(Vista server) Exchange Server 2007.  but targeted at business with 250 ish computers so larger then a small business but not an Enterprise.  Check out The SBS and Centro Community Lead Blog For Microsoft's explanation.

I am starting getting excited about WPF/E  finally there will need to deal with Flash just XAML. It runs on Windows and Mac plus IE, FireFox and Safari.  I don't see Opera in the list, we'll see.

Check out Microsoft's WPF/E Referances.  You can down load it from here.

Some  blogs of interest Joe Stegman’s “WPF/E” tales and Mike Harsh's Blog