With the Season of Giving hard upon us once again, it’s a safe bet that many of us are thinking about glitter. Not just glitter, but glitz, sparkle and shine, jingle, bells and whistles. Such, after all, are the qualities gifts — and the holidays in general — are often expected to have, and manufacturers of everything from ornaments to iPods do their best to make it happen. What, one might ask, about operating systems? Should they, too, have shiny, splashy, gotta-have features to make them sparkle in users’ eyes?