I have seen a few of the SIMA training videos. The basic ones are just that, basic. They are great for those new to plowing. They also offer them in Spanish, which is a great tool for laborers. Many of them have never even seen snow before in person! All of the videos stress safety. I consulted on two of the videos, and gave input on a third through someone working on the video.
I have not seen the two newest ones, but I would imagine they are great training tools too. The videos also include a quiz that can be passed around at the end, to see how much was absorbed by those who viewed it.
I don't plug my book often, but I will say it is written more from the driver's seat than from behind a desk. There are tons of books about running a business, so I did not focus on that. I need to do another revision, and add more of what I have learned in the past two years or so, and things I left out of previous versions.
John Allin's book is a good one to have in your collection too......
~Chuck
