Federal prosecutors are poised to score their first victory in their investigation of Hewlett-Packard's ill-fated boardroom spying probe, after <A HREF="http://news.yahoo.com/s/ap/20070112/ap_on_bi_ge/hewlett_packard_directors">a private investigator agreed to plead guilty</A> to identity theft and conspiracy charges. Bryan Wagner, 29, of Littleton, Colo., will enter his plea during his scheduled arraignment hearing on Friday morning in San Jose federal court, said his lawyer Stephen Naratil. Wagner, however, was just the bottom of a long chain of command involved in the probe that reached into HP's top ranks. His plea deal includes an agreement to testify for the prosecution, which doesn't bode well for higher-ups who Naratil said had Wagner do their dirty work.