So you are trying to use a custom css in your master page but the nice shiny font you are trying to display isn't showing up! The reason for this is that core.css will be called after your custom css file leaving your text displaying as verdana or
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Read the complete post at http://aidangarnish.net/blog/post/2007/11/Overriding-corecss-in-MOSS-2007.aspx