Hi Nina,
The tutorial by Tim is worth a look when you get time, it's at:
http://www.obrienit.se/. - You have to register on his site before the tutorial shows up and yes I understand you must be working flat out keeping up with everything, I know I am struggling to find the spare time!
I saw the post of the user confused about the tutorial from Tim regarding changing core code and it is confusing for newcomers. - For a newcomer to DNN I wouldn't recommend tackling CSS / Validation etc etc. until you have got to grips with DotNetNuke skinning in tables, it's quite a big jump and to bring in all of these extra elements would be completely confusing.
Re: my tutorials, they vary, each month I release some free and some for subscribers. - It's just the balance I have to strike as I'm doing this full time, but I try to make sure that the free tutorials are of use to everyone. - For instance releasing the pure CSS skin for free so people can learn from it themselves if they wish.
I will be interested to have a look at the work you and Armand have been doing and I will keep you posted where I am at.
I think the thing to remember here is that we have to take this step by step, there is not an official way to code a CSS website, there are a million and one possibilities which makes it much harder. - As I make any progress I will document it and share out the info with further skins etc.
As with all things it's going to take time, so I look forward to hearing about your experiments, and as you say, the next step is creating a commercially acceptable CSS design.. . .
If your experimenting with anything you want to chat about / bugs / hacks etc etc., feel free to send an IM.
Cheers,