Official Reference:

http://www.google.com/apis/maps/documentation/reference.html#GInfoWindow 

http://www.google.com/apis/maps/documentation/reference.html#GInfoWindowTab 

http://www.google.com/apis/maps/documentation/reference.html#GInfoWindowOptions 

Examples: (Please populate) 

Creating tabbed InfoWindows from XML input file: 

http://www.geocodezip.com/mapXmlTabsDirections.asp

http://www.geocodezip.com/mapXmlTabsPlus.asp  

http://www.geocodezip.com/mapXmlTabs.asp

Putting images and links in InfoWindows:

http://econym.googlepages.com/basic6.htm

Putting minimaps in InfoWindows:

http://maps.forum.nu/gm_minimap_in_infowindow.html