And they are:

Allianz Australia Insurance, Australia
ALTANA Pharma AG, Germany
Bank of Ireland Group, Ireland
Capital One, USA
IBM, USA
Merrill Lynch, USA
METRO Group, Germany
O2, UK
Staples, USA
Vodafone, UK

Summary:
This year, we saw increased use of multimedia, e-learning, internal blogs, and mobile access. Winning companies also encouraged consistent design by emphasizing training for content contributors.

Read more on Jakob Nielsen’s useit.com

Congrats to all winners.

It would be useful to know how many entrants there were, I couldn’t see that info available, maybe I missed it.