Headers are really titles. I think they should be centered. Let's all adopt this. You'd be surprised how well this looks in most places. For another eye-saving method, you can put bylines and post-footers, and the date/meta in blog entries as aligned on the right. This way their location is easy to find yet does not present itself as important as the content of an article or its title.

Update: July 14 2006
As with some updating I did with Quote Colorer, capitalization seems to matter. So I added the mirror images of the elements.

Update: October 6, 2006: Perfected.

Update: December 7, 2006: Really perfected. Really! Also changed "-moz-center" to just "center" to work better since userstyles are now optionally userscripts to install in GreaseMonkey and Opera alike. But remember "-moz-center" is a valid style in Firefox.

Update: June 13, 2007
god rid of that "threedshadow" crap. Replaced with a css property that mozilla can use, in spite of my formal ed