Nintendo Sells 500,000 DS Handhelds in First Week  NEW YORK (Reuters) - Nintendo Co. Ltd.&lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=7974.OS qtype=sym infotype=info qcat=news"&gt;7974.OS&lt;/A&gt; sold  500,000 Nintendo DS video game devices during the first week of  sales in U.S. stores for the new handheld featuring two screens  for game playing, the Japanese game maker said on Wednesday.