We have also been using D for computer graphics and game programming as of this year! :D
Totally forgot about that; sorry Mike ;)
No worries at all! :)
Lecture videos or notes?
YouTube series has tutorials, and course videos are on my website. More slides and such will be posted on my website otherwise.
Yes, UVU. And also yes. If I find myself needing something low-level and performant, I have a hard time justifying the ramp-up time required to use D since there is a near zero chance I would use it in my current or future employment. While that isn't always how I decide what technologies to use in my personal time, it definitely is a factor that tips the scales towards a more mainstream language