The LinkedIn iOS SDK by LinkedIn gives developers the tools they need to integrate LinkedIn into their iOS applications. This SDK provides SSO authentication, deeper linking into member data, wrappers to make authenticated calls to LinkedIns APIs, and more.
Free blogging service Posterous is simple to use, but posts several types of content via e-mail or web: video, audio, pictures, and documents. For some users, though, they might prefer more enhancements to the interface, or a mobile app. For them, and the developers that cater to them, there's the newly updated Posterous API. A complete replacement and rewrite to the previous version, this allows a lot more access to developers, including administrative options like adding sites and users.
The symbiotic relationship between APIs and end users looking to consume the data they provide, got stronger today with the release of an upgrade to ActiveMatrix BusinessWorks software from TIBCO Software. Version 6.0 of TIBCO ActiveMatrix BusinessWorks adds support for RESTful APIs and enhanced tools for managing the mashups of data drawn from multiple sources.