publishing workflow?

Dears,

we have two environment, one as pre-production and one for production, the process we use to move content to production is manual as follows:

1) business users add/edit content on pre-production environment

2) business users approve content on pre-production environment

3) business users publish on pre-production (this means that content is moved to the production environment (management server not delivery) )

Then on production the following is done:

1) admin user search for the content changes done by business users on production (management)

2) admin user approve and publish those content to production (delivery)

Any idea how to automate this using something like workflow or just a smarter way to let production admin user notified by whatever content the business user changed on the pre-production like by mail or something instead of searching for the changed ones manually?