How's that for a dramatic headline? Groupy is a new program from Stardock that does something so simple that, in hindsight, seems like it should have always been part of the OS.  It allows users to drag windows together and create a single tabbed window. Like so: A few years ago at CES, I showed a prototype of it to Mary Jo Foley , Paul Thurrott , Brad Sams and others.  The motivation to create Groupy came from the frustrating of having lots of windows ope...