Sponsorship Features

Because my CollectiveX group is a localized group, we have been discussing recently the potential of attracting local sponsors. It would be great to be able to offer these sponsors features which are built into CollectiveX.

1) Logos/advertising on email notifications.
2) Letter/ invite templates that can be produced within CollectiveX and mailed to members. Sponsors would appear on the letters/invites.
3) Space on the site.

Where is CollectiveX in terms of the advertising model?

I imagine a deal in which a proportion of the sponsorship funds go to CollectiveX.