How hard do you try to for un-breakable layout?

[F-b0mb]

I am just curious how important you believe it is to make your layout unbreakable through text re-sizing, window resizing or whatever else may break a layout. For example if you style links to have a nice rounded shiny background do you use just one image and not worry about the text being sized too big for it? Or do you add a bunch of extra markup so you can make the background expandable? Just curious what sort of philosophy most of you have concerning such issues.

[twodayslate]

i try to make my sites for any resolution. 800x600 min
i don't care about what the site looks like when people resize the text. i can't really control that :/ I assume people have the default font set at 16pt

edit:// browsers have pretty advanced zoom features. they don't mess up the sites too bad