text: D.C.'s Cogent  Expands in 23 Markets The business-internet firm plans to announce Friday the latest move in a recent buying spree, a deal the company said will give it 2,400 new business customers for its high-speed Internet service.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;