Apple-Rival Creative to Double MP3 Player Lines  SINGAPORE (Reuters) - Computer audio equipment maker  Creative Technology Ltd. said on Thursday it would double its  MP3 player product lines from its current eight by year-end,  stepping up competition for rivals such as Apple Computer Inc.  &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=AAPL.O qtype=sym infotype=info qcat=news"&gt;AAPL.O&lt;/A&gt;