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I know, I posted that too!
OpenStudy admins are working on this. The current issue is getting such a large application such as OpenStudy to fit nice and neat into a more compact version that can run on the phone. OpenStudy has had test-apps in the past, but they can't get it to run correctly yet. Be patient and maybe once they pull in enough traffic and revenue for funds and support, then you might see an application.
It's not just correctness, but also effort, unfortunately. iPhone apps are a significant investment of time and effort, and we're currently focused on improving the site and getting it self-sustaining before putting in the time needed to build an iOS app.