I just wanted to add my name to the long list of thanks that you have already had for the tutorials posted here.
I'm coming to this as a PHP web developer who has always been daunted by the subject of Object Oriented. I tried learning this 10 years ago when still in uni and it just didn't click with me so I passed it by. Whilst I don't use code on a day to day basis, I have a huge interest in game development with the aim of one day publishing my own ideas.
The C# crash course has taught me an incredible amount in a short amount of time and I feel like OOP is actually achievable now.
One point to raise would be whether there is any possibility to include complete code in some of the tutorials as you post snippets throughout. Sometimes when I see the snippets, I question where abouts in the code those snippets should be ending up but this may just be the fact that I tend to be reading these tutorials at 11pm when all the family are sleeping!