During MWC last week Sascha of netbooknews.de met up with some developers of petitpetit.de who were introducing their new PTPT touchscreen GUI which is said to be a bit of a mashup between Sugar OS and an expert system of the 80s. This is an interface and navigation solution designed for optimal data and media organization on mobile devices.
While it looks fairly simple at first, it's promised to be a very complex interface that is quite powerful if you know how to use it to its full potential.
The best way to get an understanding and feel for how it works is to see it in action. Thankfully netbooknews deliver with an 11 minute video which you can watch here :-