I can't really comment on the technical stuff since I haven't used max in god knows how long, but you could probably slim these videos down quite a bit. The first one, for example, could start at about 1:20 in and you wouldn't be missing anything. In fact, you could probably write it up, take a few screencaps, and just make it a text tutorial.
The UV mapping one has quite a bit of downtime; you might want to watch it, write down everything you said and did, then run through it again, this time without the pauses or the "ums" or the "yeahs" or the messing around with the scaling of the UVs or stuff like that.
I don't have time to watch the mudbox one yet, but the first 3 minutes are pretty good. I'll let you know what I think of it when I have some free time
