Hi Chief, we need private member contact capability as well -- we'd like our members to be contact-able without revealing their email addresses.  We have a page where each member posts content of interest to the general public (genealogy related) and they would like to be reachable by others, without revealing their addresses. 

Cannot over-emphasize the importance of this feature to our group.  Its a make-it-or-break-it type function.

Love all other aspects of the product.  Very easy to use and definitely fills the need.