Correct that:
http://ipad.about.com/od/iPad_Guide/a/How-To-Share-Music-To-The-iPad.htm
It is possible to stream accross within your house.
From outside your house I assume this would still work if you had access to your network via a server.. I know in my house I can access and change settings, set-up downloads without being home however I do this via my Linux Ubuntu server.
