Completely free to not just use but also to redistribute and even modify to suit your needs if you will. That’s genuinely free software, not ordinary proprietary free(spy)ware…
The sole problem would be if you teach in a industry bound school. Some will absolutely have to master Maya, C4D, Lightwave, or another when leaving school…
Hello, though it’s a usefull place, i think the http://www.gryllus.net/ website’s CSS could be re-arranged to have a right look for all browsers… Additionally, Flash is not “more neutral” than H.264. As we all know (and maybe disagree with it) Flash is no more such a panacea for web presentations neither.
I have been studying UT3 and UDK game engines, and I want to make my own 3D modelings.
If I have some questions, I will visit here and ask you about them.
The only comment I would add is that it sounds like you are jumping the gun a little bit, planning to teach students and write a book on Blender if you are asking these kinds of questions.