Flash of unformated content when WIN IE is loading a page
Use <link href="..." rel="stylesheet" type="text/css" /> instead of
@import in the head of your document.
Using @import within an external stylesheet
to import additional stylesheets does not seem to cause any problems.
The existence of a <script> element (empty will do) inside of the document's
head will prevent the flash of unstyled content.
I prefer the first option with the additional use of IE conditional comments to prevent the flash, and to provide a browser specific stylesheet for WIN IE 5+.
WIN IE has an annoying bug that causes the browser to start displaying a document before it has finished loading all the applicable CSS, causing the page to start being displayed, before it has been formatted. But there are a few simple ways to stop that flashed display of unformatted content.