I was looking at the source code of the Twitter Status blog, mainly out of curiosity to see how Tumblr was put together, and the first thing I noticed was this odd block of meta tags at the very top of the header:

<!-- DEFAULT COLORS -->
        <meta name="color:Background" content="#fff"/>
        <meta name="color:Title" content="#444"/>
        <meta name="color:Description" content="#777"/>
        <meta name="color:Post Title" content="#6498cc"/>    
        <meta name="color:Text" content="#444"/>
        <meta name="color:Inline Link" content="#6498cc"/>
 
        <meta name="color:Quote" content="#888"/>
        <meta name="color:Quote Border" content="#6498cc"/>
        <meta name="color:Quote Source" content="#555"/>
        <meta name="color:Link Post" content="#c00"/>
        <meta name="color:Conversation Background 1" content="#f4f4f4"/>
        <meta name="color:Conversation Background 2" content="#e8e8e8"/>
        <meta name="color:Conversation Border" content="#bbb"/>
        <meta name="color:Conversation Text" content="#444"/>
        <meta name="color:Date" content="#ccc"/>
 
        <meta name="color:Date Block" content="#6498cc"/>
        <meta name="color:Date Block Text" content="#bbd5f1"/>        
        <!-- END DEFAULT COLORS -->

Can someone tell me what the hell that accomplishes?