I not sure I fully understand what you mean. Is it due to screen resolution/window size or the fact that different browsers render things differently? Becuase I only use (and have access to Linux) I only ever check the pages on my Linux machine using the Mozilla browser. And I run my monitor at 1600x1200... :)

If you can send me some screen shots perhaps I can fully understand what you mean. However, as an educated guess I suspect you are referring to differences in how various machines (ie. Linux, Mac, Windows) render stuff. Because I have no magic in my HTML to make things different for different machines; everyone should be getting the same HTML.
-dr