Probably something like Yammer, but for your own intranet.
We're angling towards really large organizations with our offering - the kinds of companies that are using BPM / Workflow engines, a SOA architecture, LDAP/AD, etc. But many firms, especially smaller ones, might not want or need those integrations.
And smaller firms generally view 'Enterprise' solutions as bloated consulting-ware, so if that's their market, they need to work on their messaging.