First, let me say that I really enjoy the ability to simply apply a style to the default theme by uploading a stylesheet. After working with it, I do have some suggestions:
The gallerytitle area is difficult to style because the links are h2 elements. Because these are span type objects, you can't apply a height to them. I prefer to use an unordered list type of system with a li.currentpage class for the current page.
Also: most themes have the admin toolbox positioned absolutely in the corner. If you want to use absolute positioning, it doesn't matter where in the document you place the toolbox. I think it would be best placed at the end of the document, for those who wish to style using block level formatting and place the admin toolbox in a sidebar or footer. It is much more difficult to place an object at the bottom of the page using absolute positioning...
BigBri