Different hosts for blog and wp-admin

Hi!
I’m using WordPress for my personal blog, and I wonder if there is a way (/ suggestion / hack) to use different hosts for the blog itself and the administration interface (wp-admin, wp-login, etc.).
For example, the “public” site
https://example.org/
and the admin site
https://admin.example.org/wp-login.php
I think this would be quite interesting as this makes it possible to use SSL for wp-admin.
Personally, I’d like to have this feature for setting up a staging/live environment (wp-admin should not be present on the “live” site)…
Nico.