Related items with a Content Query WebPart
Show related items in SharePoint 2010 with a Content Query WebPart based on Managed Metadata Service. See this post to see how setup this configuration.
TheRoks
Prevent XSL namespaces to be rendered in result
How to prevent XSL namespaces from being rendered in HTML result. This can simply be done as shown in this post.
Managed Metadata Navigation
Use Powershell to create a Managed Metadata ServiceApplication. In this post is a sample Powershell script shown to create the SSA.
SignalR to synchronize web pages real-time
SignalR is a client- and server-side solution with Javascript on client and ASP.NET on the back end to create these kinds of applications.