EPiServer version 7 is a major update of EPiServer's platform. The CMS' edit mode has been remade from the ground up as a single page application built with Dojo. The API features a lot of abstractions making unit testing possible and the page tree is now the content tree in which anything implementing IContent can be stored.
I've worked on a number of EPiServer 7 projects and I've also built the ASP.NET MVC version of EPiServer's template package, the Alloy web site. Besides that I also work with training for EPiServer 7.
While doing so I try to document interesting findings in the form of notes and tutorials which I file under this tag.