Wikispaces has just added GeoGebraTube to their education widget library. GeoGebraTube is a large gallery of models and animations created by GeoGebra users. The gallery currently has more than 48,000 submissions.
To add a GeoGebraTube element to your wiki just open the editor on any of your wiki's pages, select "widget," then choose "education" to find the GeoGebraTube widget. You can browse through the GeoGebraTube gallery while still in Wikispaces. You can preview the widget before it goes live on your wiki.