Idea #1 for my personal project
Collaborate with ease. Multiple people can build work together thru Trello to create mass emails
Difficult for one person to generate content for a mass email. Blog posts, jobs, local information. This can be added by trusted collaborators.
Build off Trello's excellent collaboration tools, to make generating emails easier.
People that are very active in the tech community that don't have time to generate the content needed for a good email blog.