-Stack the controls vertically on the right. Center the "blank sheet" (to make it feel more like a sheet on a desk or typewriter).
-Cut the half-sheet from the top (it felt a little crowded to me... not sure where to place your "just start typing note, but it might be nice to fade in briefly and then out).
-Adjust the alignment on the header.
-Lighten the page outline to #AAAAAA and shrink the drop shadow to 3px.
Maybe it's too minimalist, but here's how I would imagine it:
http://michael-kelly.com/minor-onepageperdaycom-edits
Good luck!
I am in full agreement with the rest of your suggestions... btw I think the shading is a bit different on different computers, which led me to the larger drop shadow, etc. But I'll reduce it a bit and change the border color.