Thank you all for the comments so far. There are definitely a lot of things there already that I need to look at.
I would like to say a couple of things about why some things are like they are at the moment, not that it is necessarily how they should be left. Forgive me if I rattle on a bit too much in places, but there are things that I didn't realise I would need to pay so much attention to until I started trying to make the site.
I have realised for a long time that I need to get more Americanisms into the site, but unfortunately I don't know a lot about the vocabulary that is used in the states, and I'm even not so familiar with some of the English terms (All my training etc has always been in German). Therefore feedback on the words I have used is very important for me.
The body lean in the diagrams is excessive, but it was intended that way, as if they were only the correct amount people would not notice them so much. The same as when instructing, the instructor has to exaggerate everything so that the students notice it, yet you don't expect the students to copy exactly. So in my current thinking I would leave the leans excessive for the moment, although this is definitely and area for debate.
Thanks for highlighting the bit on skiing in flat light, that certainly needs some changes.
Another problem is that the site also needs to be understood by people who know nothing about skiing, and little about physics. So although part of what Rusty quickly suggested "bases work by melting snow to make a microscopic lubricating layer" is along the lines of what I would like to say, unfortunately I have to be very careful before saying anything like that, and it is something I try to avoid. My current explanation is on the
Why Skis Slide page, although there should probably be a link to it in the paragraph about ski bases.
I also have the problem of how to structure the site, as there are many things that are already said but in a different page. I often get left with the decision, do I repeat what was said there, do I link to it, or is it not really so relevant here and hope that they find that while looking through the rest of the site. The site is starting to get pretty big, and this is a problem that comes up more and more.
Thanks again for all the comments so far, if the site is going to be taken seriously this is exactly the kind of scrutiny it needs, and as sibhusky thinks I am being daring to say the least, I hope there is plenty more scrutiny to come.