Okay this probably looks a little shoddy but bare with me on its purpose. This is an interface not a skin.
I haven't as of yet put any icons in, and this is a very very 2D look done on paint. I would probably go for a look like rokdcasbah has.
I stole one or two ideas from DaveC.
Okay. You can slide the vertical bar up and down (it is continuous, and loops once it gets to the end). The selector does not move the bar does!
Idealy I would not have a selector but would instead expand the item that is selected like on OSX, at the point that the vertical bar collides with the horizontal bar.
The vertical bar would be basically a filter bar. And you would but filters in there such as DaveC drew, i.e. Games, System, Applications, Music, Videos.
While the horizontal bar would store the items inside those filters.
Up and down to scroll the vertical bar up and down, and left and right to scroll the horizontal bar left and right.
My idea is to have panels that resize themselves depending on what is happening.
For instance. As you can see on the top there is a panel with a batterymeter in, you could choose in the system settings whether that panel should show the batterylife, or the CPU settings, or if it expanded both, perhaps you might want it to have a little icon in there if the USB was connected.
On the lower right side there is a panel with metadata in - perhaps when using the file browser it could change when you select a file to a panel of buttons: copy, paste, delete, cancel etc...
On the top right is a panel with a preview image, I stole the idea from Craig, and think that it would be quite a good feature if you were scrolling through very quickly.
The main panel I have an Idea for, I think that it could be used to display the output from a script when it is run, and also when the filemanager is selected in System.
Does anyone wanna make a nicer looking copy on photoshop, or to disagree.