I happened to see the tutorials on www.proetutorials.com & let me tell you that i haven't seen any thing like that on internet before. The tutorials are extremely comprehensive & easy to understand. The most important thing about these tutorials is that beside learning manufacturing from pro/nc point of view, you learn a lot of best practices of machining i.e. how to move the tool, how to get good surface finish, how to reduce tool noise etc. I highly recommend these tutorials both for the beginner & medium to advance users.