The latest on what's still a problem, what's getting fixed, and what's been taken care of, direct from the Blogger team.
Friday, February 15, 2008
Since 2/12, the Layouts page elements editor has not had scrollbars around the wireframe template. Until this is resolved, you can often scroll wide templates by clicking and dragging on empty space.
Nevertheless, we encourage template designers to use the body#layout CSS selector to add CSS styles that adapt templates to the editor.
Update, 2/29: The Layouts editor now expands to the size of the template.