A company on the brink?  That’s what Apple was before it made its dramatic comeback.  Now, in the latest Gartner report, on Q3 PC shipments (note, these are preliminary numbers), Apple’s market share in the U.S. has grown to 9.5%, up from 7.7% last year, a growth of 29.4%.  Nearly double-digits.IDC’s numbers were similar to Garter’s, pegging Apple’s U.S. share at 9.1%, up from 7.3%, a growth of 32.0% year-over-year. But (there’s always a but), both Gartner and IDC noticed that a major part of