Marian:
The work you have in mind sounds very interesting.
I just wanted to ask you if you are aware that DNN used to have support for mobile devices back in v1.0.10? It was removed along the way because it was not a "perfect" solution, it would become increasingly hard to maintain, and most important I believe was lack of interest (it was kind of ahead of the curve). The way it worked was that each module would have an additional flag in its settings to mark it for mobile like "Show to Mobile Users?". If I remember correctly, this would detect the browser and if the user was getting the site from a mobile device the request would be redirected to MobileDefault.aspx. This would then display the site using the ASP.Net mobile controls (you familiar with these? If not see this link). This required another set of mobile modules, hence the maintenance issue.
I'm almost embarrassed to admit it but I am still running my Web site on 1.0.10e basically because of the support for mobile (hey, it works), if you have a mobile device (or emulator) to try it go to www.almacigo.com. Some time ago I wrote a little application for mobile access using the mobile controls (and mobile forms) provided by ASP.Net 1.1 and was very interested in this, my hunch about the future of mobile access was right I guess, it just took a while to get traction. The DNN mobile scheme worked fairly well within all its limitations. The idea was not to show exactly the same site as you would see on the PC (like the iPhone) but something close, at least you could say that you had a presence for mobile. I tested this with various Web capable phones at the time, including my wife's Motorola StarTac with a display of only four lines of TEXT, and I was able to get the site and navigate it, do searches against a SQL database, etc. Bear in mind that the ASP.Net mobile controls can detect and automatically adjust the rendering for hundreds of devices, so you don't have to maintain multiple implementations of the modules or skins.
If you wish to play or see the code from 1.0.10e let me know, I have the package with source code, the Zip for the whole thing is 1.7MB. If you wish to contact me for this the email is cr(at)almacigo.com, I don't think this forum is forwarding responses lately.
Good luck with your project, please keep us informed on your progress.
Carlos