Writing in the (official) Ancestry.com blog, David Graham has described a new feature that will be soon be added to the online service. It sounds like a service that will help people who are researching the same families connect with each other.
There are millions of people researching their family histories on Ancestry.com and some of them are likely researching the same people you are. We are working on a new feature called Member Connect that we will be releasing later this summer to help make it easier to find, connect with, and collaborate with these other members.
He then goes on to describe the service that will help Ancestry.com users connect with others through historical records about your ancestors. The service will build a network in your Ancestry Member Tree of other members researching your ancestors. Users will also be notified about any new research activity about your ancestors on the site.
You can read more in the Ancestry.com blog at http://blogs.ancestry.com/ancestry/2009/06/19/coming-soon-a-new-way-to-connect-with-others-researching-your-ancestors.