I don't know of a module that transfers pages, modules or portals from one instance to another.  There are content management type modules that allow you to manage the workflow of content a little bit.  They allow you to create an article or peice of content, and then edit / approve it before it then goes live.  As for modules and pages, one thing we often do is just create a page or module that is visible to administrators only, play around with it and test it until it looks right, then set it to all users.  As for testing general configuration/content changes to existing modules of a live site, we unfortunately maintain two environments, a staging (like your dev) and a production environment.  We test the change to staging, and then have to again go make the change to production.  Don't really know of any easy publishing mechanizm out there that makes it any easier.  If you find one, I would be very curious to hear about it.

---

Josh McWilliam
Flatburger
Bright Hub
Jamnaytac Technologies

I can't remember some of the advanced workflow type publishing modules off the top of my head, partially because I don't use them.  Some of them seem too rigid to me.  However, they may be exactly what you are looking for.  I will do some research and try to come up with some links for you.  In the mean time, perhaps you could explain a little more about what you are looking for.  I have had several customers complain about the general lack of 'publishing control' with DNN.  I think the solution to this problem stretches beyond just modules and may require some sort of common core solution.  If you were willing to detail a little bit more what you and/or your customers are looking for, it may shed some light as to what the proper solution is.

---

Josh McWilliam
Flatburger
Bright Hub
Jamnaytac Technologies