I recently started using the computer at my office, which has a regular-width screen (as opposed to my laptop's wide screen). While updating my blog, I noticed that the page has been formatted to fit properly on a widescreen computer, and not to resize it's self on a regularly-sized screen.
For now, all I can offer are my apologies. I have no idea how to make it automatically fit your screen, nor if there's even a way. I realize it's really lame to have to use the left-right scroll bar just to read a post, but I'm at a loss. The problem with just reverting to the original size is that most of my posts already have formatting and photos that will not work with the narrower cut. I tried it and the pics just run off the edge.
So, I'm sorry. ^^ (If you are tech-savvy, feel free to leave a comment or email me about how I might fix the html. Blogger uses these complicated templates and it took me forever in the first place to get the page to show more words and less blank space. I like the width settings, but only wish it would resize automatically for viewers on 4:3 aspect ratios.)