How do I setup a "sandbox" ?
Ning To Jamroom
Deb - You say you have a developer who wants to 'play around with the look of the site'. In this case, after you have cloned the live site, reset it (ACP=>Developer=>Tools=>Reset Site). This will delete every profile, user and their content (except admin). Your developer is now free to play without risk of emailing members etc.
Hope we're not confusing you too much ?