Devzone allows an administrator to define a pool of zones that can be allocated/used/freed by normal users. Giving a user access to a zone implies root level access to all resources provided to the zone while keeping the global zone secure.
Devzone was originally developed on/for Nexenta to provide developers access to zones for porting/building packages. Since then it has been finding uses on Nexenta as well as other OpenSolaris distributions.
If you have a really great use of devzone, feel free to let us know!
Look for rootard in #nexenta on Freenode IRC if you have comments, suggestions or queries.