Microsoft has, with very little fan-fare, launched another site specifically aimed at Architects called www.skyscrapr.net.
The differences being it is aimed specifically at Solution, Infrastructure, Strategic & Industry Architects which to be fair aren't areas that Microsoft has covered much before.
The site has afew articles, blogs and links to podcasts with a novel new feature called the 'Archipedia' is to provide plain english definitions of architectural topics such as for example 'What is Architecture' , 'Enterprise Architecture' and a brief definition of SOA .
Anyway, it's a good start, I will keep tabs on the site (which will be difficult as there aren't any RSS feeds yet) and keep you posted on any more significant developments.