S P 500 Companies to Show Growth  CHICAGO (Reuters) - Third-quarter earnings get under way in  earnest next week -- led by several large banks, as well as  technology companies Intel Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=INTC.O target=/stocks/quickinfo/fullquote"&gt;INTC.O&lt;/A&gt; and Yahoo Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=YHOO.O target=/stocks/quickinfo/fullquote"&gt;YHOO.O&lt;/A&gt; -- with many expected to post double-digit growth.