I am not familar with what other companies — including IBM — are doing in this area, but I think this story is impressive: Microsoft Global Foundations Services Blog : Microsoft Recycles Waste to Provide Clean Power for Data Center R&D.
Essentially Microsoft is using manure/poop/call it what you will to deliver power that they use to drive their data centers. I think this is impressive. I hope this solution spreads (no pun intended) to other power users. Kudos to them.