Is it me?

What the *%@# is wrong with the formatting here? I've just been looking over my entries to date and my fonts and font sizes are different everywhere! It's totally maddening! Is there some trick I don't know about? Is it a browser issue? Is it an evil Microsoft conspiracy? (it looks fine in Explorer, but screwy in Firefox and Safari) I am so irritated by this I must stop typing. I'm afraid it's going to screw this one up too.