Sorry Jeff for using your blog as an example, but I noticed this is a problem on many of the blogs that have been customized:

See how your text is not always on the "white space"?

Because of that I went back and changed my background color to a white color instead of a dark color or image.

The blog looks fine when the window is maximized, but when made smaller, it doesn't always shift the text to where it needs to go.

It also happened to Brad's blog when the window was re-sized.

Sometimes it would "snap" back. Other times it would not. I'm looking at them in IE. Firefox doesn't appear to have the problem. I usually use firefox myself, but I know a lot of clients who still use IE.

Anyway, I just wanted to pass this on. It's not always when the window is resized, sometimes it happens when you leave a window to work on another task (or tab) and then come back.