@buurmas thanks for the vid (though I had seen it on engadget first). That vid had one aspect of my concept in its UI (de ja vu?), I'll let you guess what that is once I release it.
@Rebski and ysss I've had some progress on my UI.

But then I had an idea that this UI might be quite good on the N900, so I am slowly tweeking some areas to suit it so.

Remember that this concept is
a whole (eg similar to how iPhone's OS complete)
very intuitive (you find things at the first expected places) unlike Snow Leopard
everything is categorizes to you in the easiest form.

The first release will be a coarse release of flip images (ie slideshow) so their won't be any polishing/eye candy.
This is because I've created most of the icons by hand, so if someone with graphic experienced picked it up you will be WOWed.

Just to give you more info:
I've concluded that this UI will be aimed at MeeGo and should be adopt to the N900 nicely.
I am constructing it a complete and from scratch.
I've already finished the entire design by paper sketches and transferred these into wordpad.
I've finished drawing 50% of the concept with Paint to illustrate the concept.
I've just realized their is more things I need to add to my design:
for instance illustrating the interface when you hit the shortcut
and adding portrait view (a big challenge when there is emphasis on multitasking).

Instead of publishing the progress so far, I've decided to continue on these.

And just to clarify why I've concluded this will suit MeeGo primarily:

The concept is designed multi-finger friendly (but mouse/keyboard are very encouraged),
Multitasking is at its heart and is meshed around full-blown desktop Linux OS.
It's aimed at all devices with screens between 4" (854x480)* to larger touch devices like 12" (1366x768).
It scales beautifully to 50" TV screens for some video/gaming fun.

With following updates I might make it aimed between 3" (640x360 - half HD) to 12" (1280x720 - HD). But it will take some many optimizations until it can be finger friendly AND intuitive AND fitting on 3". It wont be specifically aimed at but it will again scale perfectly to large (>40") TVs with Full HD (1920x1080) but using same sizing placements as the 720p or the 480p since large TVs are viewed from a distance and sizig is about displaying information orderly instead of cramming alot of information into that screen^.

*It actually started on this pixel ratio and size for pocketable gaming PMP I designed for OPandora.

^Just to prove my point think; the iPhone displays 4x4 widgets. Now think how much more difficult/slow it would be to use/find Apps if the widgets were arranged in a 6x6 configure. See my point now?

Some pages I would leave only 12 Apps as it would make spotting them easy.