Marcus Lasance has a sterling reputation in identity management, having contributed to its evolution for many years now.
He was well known as managing director of MaxWare (recently acquired by SAP) and is now involved with Siemens. For those not familiar with the European landscape, both of these companies have done extraordinary identity work.
Marcus has put together an identity management survey that I promise isn't an advertising gimmick, and has offered to share the results with the blogosphere, so why not help out? I did. Now I'm going to pass the URL on to some of my friends in the Microsoft IT department, since they will have more relevant answers than I do as an architect. You may want to answer it directly, or pass it on to your IT colleagues.
UPDATE: Many people have reported problems with the first version of this link (which apparently thanked me for my survey response… At least you know I tried it!) I think the new link fixes the problem.