Gartner reviews and evaluates technology companies with their "Magic Quadrant" Reports. They recently released their User Provisioning report for 2012. in it they named the following companies as "visionary leaders" in this identity space category.
Hitachi ID Systems
Yes, most of these are the usual names we have expected to see in Enterprise computing.
But don't forget, they also protect you, the consumer, whenever you buy products or exchange information with most retail companies who need enterprise-class technologies to handle their supply chain and transactions.