AOL's Broadband  Service in South to End America Online, which earlier this year stopped signing up new broadband customers, is telling existing broadband subscribers in nine Southern states that they must find a new broadband carrier by Jan. 17. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-AP&lt;/B&gt;&lt;/FONT&gt;