I participate in two group blogs about Street Art: http://graffsencapitales.wordpress.com/ and http://voyageenephemere.wordpress.com/. It's a pretty funny experience. The only inconvenient is that as an author (not administrator) I'm not able to choose the kind of email notifications I want. So I receive dozens of "like" email notifications in my mailbox I'm not interested in.
It would be a great idea to give each author the possibility to control its email notifications in the group blogs.
The blog I need help with is venezuelatina.com.