looks good
but you should get a mic with less noise or a program with good noise reduction (there is surely a free one for that out there) and maybe speak a little bit slower so it also helps foreign people. I myself had no problems understanding it, but they say I'm good in english (at least understanding, speaking (and sometimes, writing) is another matter)
Also, why don't you make the videos open? For example, a
CC-by-nc-sa
Sure, this is your decision, but I think it would be nice to use the vids also on other pages, for example in the wiki here (if it will be one)
EDIT: WTF did you do in the last video in the middle? never caught someones voice drop so fast without inhaling an heavy gas
