The Share As option will be available with ArcGIS Desktop 10.1. You will be able to publish to your own ArcGIS Server, and to ArcGIS Online if you purchase an organizational subscription. Here's a link for more information
http://www.esri.com/software/arcgis/arcgisonline/index.html
thanks,
Mike
Can I share to ArcGIS Online using a personal use license? Or is that feature only limited to organizational licensees?
Thanks,
Jack