IBM has launched the Lotus Connections deployment Wiki
where you can find information to help you get up and running quickly with Lotus Connections. On this site you will find a variety of deployment scenarios that have been validated by IBM. You can also share and find deployment experiences from the community of Lotus Connections users.
The wiki contains a few documented scenarios for deploying Connections, and being a Wiki allows customers to contribute their experiences in deploying connections. I hope people do contribute will be interesting to see what choices people are making in their deployments.