Google maps adds a few keyboard shortcuts for manipulating the map:
'C-b' is google-maps-pan-left: Pan the map left.
'C-f' is google-maps-pan-right: Pan the map right.
'C-p' is google-maps-pan-up: Pan the map up.
'C-n' is google-maps-pan-down: Pan the map down.
'C-c +' is google-maps-zoom-in: Zoom in on the map.
'C-c -' is google-maps-zoom-out: Zoom out of the map.
Note: In Conkeror versions older than 2011-09-23 (including version 0.9.4 and earlier), '+' and '-' were bound to zoom the map instead of the keys listed above.