Understanding Microsoft web communities

Sometimes, I have hard time to remember all those communities Microsoft has created on the web. For example, there's MSDN (of course), Channel 9, TechNet, CodeZone, and so forth. Luckily, I found by chance a web site that lists them all: mscommunities.com. Here's a quick rundown of the current sites:

• ASP.NET: a web site devoted to web application development with .NET.
• Channel 8: a site for student developers looking for information about Windows development.
• Channel 9: The video and discussion site about latest and greated in Windows development.
• Channel 10: a "technology passion" site, sharing "music, mobility, photography, videography, gaming" stuff with those who enjoy these topics. An oddball site in my opinion, but I like it. :-)
• CodePlex: a site to host your open-source projects, also the successor to GotDotNet.
• Codezone: a site for developers, hosting videos, training material and tips.
• IIS.NET: a site devoted to the Internet Information Server web application platform.
• MIX Online: a site for web people: developers and designers alike.
• MSDN: THE developer site for all Windows and web developers (you knew this already).
• Silverlight: the name says it all, a site about Silverlight, the Adobe Flash killer.
• TechNet: the site for Windows IT professionals.
• WindowsClient.net: a site devoted to rich client application development on Windows, especially with Windows Forms (WinForms) and WPF (Windows Presentation Foundation).

I only wish that there was a single RSS feed to have the best topics of all these forums/communities in one!