Synch all my crap on all my devices. I own a desktop PC, a macbook pro, a GPS device, a cellphone and an ipod touch. When I want to drive to a friend, I have

Synch all my crap on all my devices. I own a desktop PC, a macbook pro, a GPS device, a cellphone and an ipod touch. When I want to drive to a friend, I have to look up his address first, write it down, and then go to my car. Why doesn't my GPS have an address book? This may be solved by buying a GPS that's actually a smartphone, of course :-)