Good start Mirk - keep it going.
The only initial feedback which comes to mind is the icons are too overwhelming.
I would suggest the Icon sizes in the standard icon view should be the Big Icon view sizes thus allowing more icons per screen in the standard view. i.e three rows of icons rathe than two.
Filmstrip view should have three columns by 2 rows of preview icons with a larger thumbnail at the end.
Just my humble opinion.
DMAN