Comments:Tutorial:GeoGebra with Moodle
GeoGebra Manual
To insert GeoGebra Applets into Moodle, you may use the GeoGebra filter.
Another option is to use File > Share in GeoGebra 4.0. This way you obtain HTML code which can be directly inserted into Moodle pages.
Better integration of GeoGebra into Moodle is in development, see developer's wiki for details.