Hi there, earlyhigh.
You will find that the flattened out .JPG version of your stitched panoramas can be found in your iPhone/iPod Touch/iPad's default camera roll. You may email these, the same that you would email any other image.
If you want to share the wraparound immersive panorama experience, the simplest way to do this (without using other programs, etc.) is to just upload your panoramas to your account here on the website.
It is completely possible to make any of your panoramas or photosynths that you have on your account either private or public. For more details on how to edit your panoramas to be private on the site, please scroll to the bottom of this page: http://photosynth.net/privacy.aspx