In addition to the User Profile in the Control Panel, there should be "Profile Versions" generated from portions of the user's information.
Users should be able to flag which portions of their profile are visible to and searchable by which groups / connection types
Users should be part of portal wide search results
Users must have an easy way of adding information to their profile, including project information, skill sets, and key words.
User profile information must be searchable across the system in a "People Finder"
Users profile information can be searched by specific meta-data such as bio, project, tags, frequent activity
A recommendation engine should recommend connections for the user based on their expertise, their contacts, and similar activities.
Like LinkedIn, allow other users to make comments / recommendations on that person.