A few days ago I landed the "Map It!" feature along with the AB_OUTLINER_BRANCH.
Select a card with a US postal address and click on the "Map It!" button in the card preview pane to see it in action. You can hide this button by setting the hidden pref to "" or point it at maps.yahoo.com or expedia, if you don't like mapquest. see http://www.mozilla.org/mailnews/arch/addrbook/hiddenprefs.html#Map_It_pref for details. -Seth
