[Users] Double Map Panels with interdependence

[Jason Hochschild]

Has anyone put together an OpenLayers/GeoExt layout with 2 maps that
are interdependent to each other?  I've dabbled with putting multiple
independent map panels in one page, but I am thinking something like
this:

http://www.esri.com/landsat-imagery/viewer.html

A pan, zoom, etc on one map is mimicked onto the other map.  It should
be straight forward to capture all the user interaction and then run a
function to do it to the other map (I only need 2 maps, the example
above has 3), but if someone has an example I can build on rather than
start from scratch, it would of course save some time.  Thanks!

Jason