Amazon Posts Profit, Outlook Disappoints  SAN FRANCISCO (Reuters) - Amazon.com Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AMZN.O target=/stocks/quickinfo/fullquote"&gt;AMZN.O&lt;/A&gt; on  Thursday posted quarterly earnings that more than tripled on  strong international sales but offered an outlook for 2005 that  was below the more bullish analyst forecasts, sending its stock  down 8 percent.