Needing Some Feedback

I have two issues that I'm batting around that I'm curious about:

1. Missio Dei on the City
Bryan and I have batted around the idea of setting up a social network for Missio Dei Church, similar to Facebook, but available only for members so that we can engage in frank "family" discussion. The website is called, "The City" and was developed at Mars Hill Church. We utilize this heavily in the Acts 29 Network and find it to be a remarkable tool.

The positives:
This would allow our members a way of continuing spiritual dialog that arises out of sermons, community groups discussions, service projects, etc.
It would offer another connection point to assist in communication.
The dialog can take place in an environment of safety as it will not be open to anyone and everyone.
The site would allow us to keep upcoming events in front of people as we can utilize it to advertise things.
The site would serve as a place to share prayer requests that come up in the middle of the week, so that we can pray as a community.
The site could facilitate planning meetings and provide a place everyone can come and continue a discussion.

The negatives:
It is one more social networking tool that isn't necessarily streamlined to other places you may already be connected (i.e. Myspace, Facebook, Tumblr, Twitter, blogs).
It is not free.

Would you utilize this if we offered it?

2. Fall Series on Ephesians
As I begin prepping for the fall series, I am curious if it would be helpful to put together a study guide to aid your study of the book as we work through it together. The study guide would include background information that would be helpful, but not timely for a Sunday morning setting (i.e. in depth look at authorship, setting, etc.). Would this be a helpful resource, or would we be picking them up from the floor on a weekly basis?

Feedback highly anticipated.