&gt; Unless the metadata becomes a first class citizen in the filesystem, any attempts to layer it on top will have problems.<p>Remember when it seemed like Mac OS might give us a modern era of rampant metadata (<a href="http:&#x2F;&#x2F;arstechnica.com&#x2F;apple&#x2F;2005&#x2F;04&#x2F;macosx-10-4&#x2F;6" rel="nofollow">http:&#x2F;&#x2F;arstechnica.com&#x2F;apple&#x2F;2005&#x2F;04&#x2F;macosx-10-4&#x2F;6</a>)?  Ah, those were the days.