e-Room
A graphically-spartan, but certainly plug-and-play corporate intranet system, with message boards, excellent document-management features (including versioning), and voting.

InSchedule Calendaring and InLine Resource Management.
A suite of internet-based applications for "the extended office" - a centralized calendar of company-wide events (training, meetings, etc.), as well as products for managing shared resources and hoteling workspaces.

Disruption Network
Not a commercially-available product, but a demo of a sexy, multimedia corporate intranet created by Work Virtual and Art Technology Group for BDDP Advertising Worldwide.