I can't help but feel that emulating the iOS springboard in an app is simply confusing for the end user. Even I sometimes get confused by them, a common case being hitting the home button when reorganising icons and being unexpectedly sent to the home screen. There's a host of other ways to give the user access to a series of views that work way better than this particular solution.
It is true that it might be confusing for the end user but it is a nice alternative to classic Tabs. Especially useful if you need to have more than 4-5 view controllers in your stack. On the other hand, the project can also lead to something like the latest LinkedIn app has. Just check it on the App Store. http://itunes.apple.com/us/app/linkedin/id288429040?mt=8
There have been a few submissions from cocoa controls lately. It is definitely an awesome site and I recommend checking out more of the libraries on it.
As for SESpringBoard it doesn't seem nearly as useful as some of the other libraries on cocoa controls.