www.joomlatools.com/extensions/logman/
I am a big user of the above to keep track of changes on my websites. I can just look at one screen to see what people are up to and a full audit trail of what is getting used is provided.
It can be integrated with from any extension with a small amount of code.
A plugin for Membership Pro would be fantastic and could trigger increase sales as you would get advertising via their website.
Alan
