Is there a way to share photos from one iTunes account with another?
You can setup your iPhoto to accept your incoming photo stream, then create a smart folder that automatically includes the contents of it, and subsequently sync's it to a 3rd party service such as Flickr, or Facebook etc.  This will allow you to share the photo stream with anyone that can access those services.  It's not wholly automated, and required you to have iPhoto running, but it may suffice.