I'm impressed.
Wow, I usually hate tutorials, but for some reason you remind me of a teacher I used to have with you style of lecture, and you did a good job from what I could tell.
A few things...
First, and most obvious, you should have redone some of your audio to make everything smoother, plus you could have avoided the somewhat excessive "ums" and pauses.
You graphics to support your lectures could be improved, but at least you had something to look at when the lecture was being given.
Overall, nicely done, but I think it has room for improvement if you are up to it. Breaking up your lectures a little would make it easier for someone to go back and find the exact part that they might have had a question on, rather then waiting through half a lecture to hear it once.
Again, nice job.