What are you looking for in a Domino CRM?

Couple of days ago, Phil Salm asked about recommendations for a CRM for Domino. There are a number of ones available on the market. Some have amazing features for the enterprise organization. However, for a small business most of the features are not needed. We are working on a project and would like to know what key features that one needs in a CRM besides basic contact management, tracking calls and appointments, and managing an email campaign.