So one of the things I work on is to make sure the pages I create display properly. There are a few cool tools out there that help with outlining and making the whole process a little easier. This isn’t really for casual browsers but if you make your own web pages give them a try. You may be surprised what looks one way in one browser looks totally different in another.
I knew about the one for Firefox from a while back thanks to Dennis but these are others are a big help too.