Currently if someone posts a large photo or non-wrapping content the content overlaps the background graphic on the right. This is primarily an issue with the non-frames view though annoying for framed view if trying to view the content.
In CSS you can specify what happens content overflows from a fixed area. If the width of the content area is fixed, then the overflow declaration could specify that a scrollbar appear for that area allowing for horizontal scrolling of the content area. This would eliminate having to scroll the entire page horizontally and dealing with the post overlapping the background image on the right.