Amongst the different vendors I've spoken recently, JanRain is definitely one of the most interesting ones - and will most likely make it into the list of next year's Hidden Gem vendors. JanRain has had some popularity as one of the initiators of OpenID and with their OpenID libraries and other related services. However, they have made an interesting move during the last years and now provide what they call a "user management platform for the open web". In fact, they provide products for web sites and social networks to enhance the user experience around registration and the services which deal with user data.
Amongst these products are solutions which enable web site developers to quickly integrate registration features which rely on social networks such as Facebook - use your Facebook account to register... There are several other services on top of this. But there are as well capabilities for stepping up in the authentication depending on the types of interactions and transactions someone is doing.
JanRain has managed to find an appealing and obviously successful business model around identity services. They are not focused on any particular type of authentication like Information Cards or OpenID but provide the frameworks to deal with all these different approaches. And that is exactly what most organizations need today when building their online presence: Flexibility in dealing with different online identities and an user-centric approach which allows users to quickly and easily register. JanRain definitely is worth a look for any web developer and especially for all the people responsible for online marketing.