I often touch on the need for professionaling web 2.0's tools and usages in order to make them consistent in a corporate context. But we also have to keep in mind that there are some tools and usages that exist on the general public web that businesses haven't considered yet and that they should bring inside their firewall.
Why three tools ? Because I didn't find more. Even if I more addicted to the Harvard Business Review than to Techcrunch, it seems to me that as regards tools the essentials...