They seem like a useful beginner's guide, but it's very verbose. That may be good for beginners since you spell out everything that's happening on the board. However, the videos aren't very interesting for experienced players since most of the commentary is just obvious statements about the moves and facts of the game. I didn't really watch very far into the videos since they are quite long and I was getting bored, so perhaps the commentary becomes more insightful further on.
If you are going for the beginner audience (which I think is great as it can introduce new players into the game), I think the suggestions that other people had about map labels and unit icons would help improve the ability for the watcher to follow along. The basic "A" and "F" unit icons available in jDip are much more clear.
However, if you want to cater toward a more experience audience, map labels wouldn't be necessary, but the more clear "A" and "F" icons would still be appreciated. More importantly, with an experienced audience, I think the commentary would need to be improved in order to focus less on the obvious facts about the moves and more on insight and motivation behind the moves. The delivery also could be a lot more crisp and concise. Perhaps you should also get statements from other players and script out what points you need to cover. Video editing could also help improve the length and fix some verbal mistakes.
I don't mean to be too harsh in my critique. Hopefully you view these comments as constructive. You are clearly willing to put a lot of effort into this and I'm sure you want to deliver the best product you can. My advice can be outlined by the following: know your audience, prepare your statements, reflect on and condense your statements, practice and edit to make the final product perfect. If you put some more work into it, I'm sure you can produce some great videos.