Recently Apple started running a static analysis on iPhone App submissions to detect the use of Private APIs. The Three20 framework has several references to private APIs in test code and so apps using the framework were rejected.

The issue has now been resolved in the main Three20 project, however the latest version only supports iPhone SDK 3.0 and above.

I have taken the last release of Three20 which still supported iPhone SDK 2.2.1 and cleaned up the private API references.