Interesting evolution here... often sketches aren't enough to explain an idea, so you had to use a real example. I think it's ok to add other media, or as I did at my video, to remark some keywords.
Keep on sketching :)

PS: I'm not uploading because I'm ill now and I can't speak well; hope to be back soon :]

Liked the mix of sketching and the screen tutorial.

It could have used more sketch casting in the presentation to justify it's use.

I would love to see a sketch cast on How to Sketch cast form the technical side. On a prior sketch cast you listed the software and hardware needed. I am new to audio/video presentations so I would have enjoyed learning about how to integrate the products you mentioned to do exactly what you are doing in the sketch cast.

more sketchcasts, please.

Fabulous! I just linked this to my site, as I've got clients who rarely read blogs or know much about the web. Also off to stumble and digg. Terrific. thanks..p.s. I'm subscribing. love the sketches.