Here’s a survey result that should surprise no one who has fallen in love with a useless but fun USB gadget: the interface is the most popular and most used on both home and business computers.For cell phones, Bluetooth pretty much tops the list.Flash drives topped the list of devices connected to computers via USB, followed by printers and digital still cameras. The survey, conducted by In-Stat, did not delve deep enough, it appears, to determine how many people have the USB toaster or ashtray.For home and