You know, not a day goes by when I don’t come across some marketing hyperbole that tries to convince me that some new wonder gadget will replace some or all of the existing gadget in my life. A cellphone that’ll double as my MP3 player and digital watch. A PDA that will replace my notebook (both dead-tree and electronic). A GPS receiver that will handle my digital media and transform in-car entertainment forever. But are they any good?