GeoContent Plus is a web mapping component for Joomla! 2.5 and Joomla! 3, it is a complete re-implementation of the previous GeoContent for Joomla! 1.5 components and it comes with a lot of cool new features.
Don't miss the map renderers and layouts example pages to get an idea of the features available in GeoContent.
With GeoContent you can also edit maps from the front end. This feature is enabled on this demo site and you can try it now by choosing "Map editor" from the menu.