Looks like Firefox 0.9 is doing funny things to g-blog.net page layouts. I’ve seen it with the default as well as the house of blues themes. The sidebar keeps getting expanded to 100% of the window width. I think the culprit might be the dropdown menus. However somethign’s different about the control panel and entry writing pages, as they appear to display fine.
I’d post screenshots, but I don’t have any decent image manipulating software on this machine. (Have you ever tried to resize an image in paint?)