Our API directory now includes 30 authentication APIs. The newest is the Yubikey API. The most popular, in terms of mashups, is the Google Client Authentication API. We list 6 Google Client Authentication mashups. Below you'll find some more stats from the directory, including the entire list of authentication APIs.
There’s a lot of focus these days on securing applications and the devices that consume them. But when it comes to all the layers of software in between that enable all the applications to be consumed, security has largely been an oversight.