Hewlett-Packard, IBM, SunGard Data Systems and other companies have been working with dozens of Gulf Coast businesses to keep their computer systems running in the aftermath of Hurricane Katrina, but the service companies say many were unprepared for the disaster. IBM, which has about 100 disaster recovery clients in the hurricane-ravaged region, said last week that dozens of affected companies had switched on backup networks and data centers in Big Blue facilities as far away as Boulder, Colo. HP's disaster recovery clients are working mainly out of the company's Alpharetta, Ga., offices. A few clients also requested mobile trailers complete...