Building a 'Mango' App

The intro does mention that the "real purpose" of this tutorial "is to explore some of the big new features in the 7.1 release"... So I think it's more geared towards developers with WP7 experience who want to learn what's new in Mango. (I don't mean that it necessarily does a very good job at even that, just pointing out.)

C# dev here too. I'm curious, was there something specific that you found confusing?

I can understand there's a pretty big spectrum of stuff covered here really quickly. I understood the datacontext database stuff because that's what I work with every day. But, I've avoided Silverlight/WPF successfully for years now and expected the view stuff to be a bit crazy. Lucikly I do a lot of MVC3 which makes all the Model techniques used here pretty familiar as well.

I would love to develop some WP7 apps. I've been wanting a WP7 for a long time...but Sprint only has 1 model and it's already a year old.

.NET is strongly typed so using String.Format in the manner this example does is safe, as long as the values you're inserting are integers or guids or such.