Noondueler: http://www.summitpost.org/users/noondueler/39033 has agreed to have me share the Potato Peak page with him: http://www.summitpost.org/potato-peak/767981

How do we do that? He's still the page owner, but I would have ability to make changes.

You are still the page owner, he is a page admin. So he can do pretty much as much with the page as you can. The only draw back for him is that he gets no power points from this and it doesn't show up on his profile.

The elves have wanted the ability to truly share a page, however this was never implemented into the site.