Bob Mixon has a great list of references. He’s right, there aren’t many formal sites/books out there worth buying… bloggers are the best resource in my mind (many are listed in my SharePoint links).
Email courses
I love using email courses to deliver simple topics, dripped out anywhere from a few days to upwards of 10 days! Here you'll learn about the FREE email courses I've written and published under my company, Voitanos.
On-demand video courses
On-demand video courses are my preferred way to teach. Here you'll learn about the courses I've authored & publish under my company, Voitanos.
Prior to launching Voitanos, I published my video courses through Pluralsight. You can find those courses listed here as well.
All publications & learning resources
From time to time, I create learning resources for clients, including Microsoft. Here you'll learn about all these resources.
This includes articles, books, code samples, tutorials, and Microsoft Learning modules.