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 main project has only supported iPhone SDK 3.0 and above for some time now. Not good if you want to support users who haven't updated to 3.0

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

I've submitted an app using this which has now been approved (Food Heaven)

You can get my Three20 version here here.

Any questions give me a shout.