Links
Many great examples can be found at the GeoGebra home page -- especially check out the on-line book: http://www.geogebra.org/book/intro-en/, and the Wiki: http://www.geogebra.org/en/wiki/index.php/Main_Page
Fantastic videos and examples from Dr. Linda Fahlberg-Stojanovska: http://math247.pbworks.com/Learn+and+Use+GeoGebra
Geometry Investigations by Steven Lapinski: http://teachers.henrico.k12.va.us/math/GeoGebra_Site/
(More soon!)