Google Maps is awesome.  It is phenomenally cool.  It is the quintessential definition to many of what is Web 2.0: a very dynamic, very interactive, very usable site that presents what I want in a way I want it right now, lets me use it intuitively, and publish it to anywhere else easily.  Some may argue Google Maps is the reason cell phones now have GPS's in them: for turn-by-turn directions based on map data downloaded to the phone on demand. Google Maps is also the quintessential example of a mashup: take two unrelated services, push them together, and you've got...