At this time, you can specify the permissions on the blogs by user.
It would be great if that would be possible on group base.
That way you can very easy manage the rights for a large group of bloggers (magazine..°
For example :
Member A, member B and member C are in the group 'Financial Editors'
The group Financial Editor has publish rights (or has members only rights) on all financial blogs.
Member X and Mamber Y are in the group 'Fashion Editors'.
That group has publish rights on all fashion blogs.
Member D and member E are in the group 'Authors'
The group Authors has draft rights on all blogs.
Member Alfa is in the group chiefeditor
The group chiefeditor can publish and deprecate.
get the picture ?