The interview was particularly interesting as it covers Tekpub moving from ASP.NET MVC to Ruby on Rails and ASP.NET MVC is the subject of a book Rob Conery co-authored. This says a lot about the position Microsoft puts small companies in when trying to build a product. It also says a lot about the advantages open source gives to these small companies.
As often is the case, cost is a big factor. Please give it a read. The interview is up now – Architecting TekPub – Moving from ASP.NET MVC to Ruby on Rails.