Intranet Site Navigation - Topical Versus Organizational

We are in the process of redesigning out intranet and keep running into navigational issues. We want to keep things user and tasked based. But we also want to represent the structure of the firm.

I found this post by Bob Mixon with his take on navigation for an intranet: Topical Versus Organizational.

"1. Store content where it is easy for content owners to manage. If you do this, the chances of the content staying fresh is greater.

2. Create additional navigation, as needed, to facilitate the location of information from a topical approach."

So use both methods, a task-based approach and an organizational-based approach.