Many websites out there would benefit from following these tips. Unfortunately, layout seems an underappreciated art on the web -- or maybe it's the variable widths that just makes it too hard?
I've seen very few variable-width websites in recent years. Fixed-width (at around 960px) seems to be a much more standard design practice. This happened for a couple reasons. Chiefly, monitors have gotten wide, and percent-based widths often get too wide. Secondly, browser zoom has become more available, giving variable width little advantage over a fixed width.