service provider frontend delegation options

[Terry]

Hello,

I am trying to get bind in to replace a simpledns implementation due
to the "viewing" capability with bind.  However, we also have a need
to be able to give our customers access to modify zones that they own.
 I only see one that comes close to allowing this named "DNS Control"
or "RocketControl DNS".  It appears to be a good idea but I want to
see what everyone everyone else is doing.  Certainly I'm not the first
one to want this type of functionality.  Any ideas?

Thanks!