Apparently Microsoft is one of them. Actually our Intranet is pretty good and search on it is very good. Here's the top 10

  • American Electric Power (AEP), United States
  • Comcast, United States
  • DaimlerChrysler AG, Germany
  • The Dow Chemical Company, United States
  • Infosys Technologies Limited, India
  • JPMorgan Chase & Co., United States
  • Microsoft Corporation, United States
  • National Geographic Society, United States
  • The Royal Society for the Protection of Birds (RSPB), United Kingdom
  • Volvo Group, Sweden

Lots more detail from Jakob Nielsen.

Link to Intranet Design Annual 2007: Call for Entries