Apple's engineering department is still working hard toward the summer release of iPhone OS 3.0. It has released beta 4 to developers only two weeks after beta 3 was released.
Like most Apple updates, we suspect that the new beta 4 includes several stability and performance enhancements that might make the beta more pleasing to use, if you are testing it.
We've heard from some early beta testers complaining (see article comments) about the number of issues they were experiencing with the previous releases.
It is too early to tell what kinds of changes have been made in beta 4, but we suspect that it will not take long for people to discover them.
Read CNET's additional coverage of iPhone OS 3.0:
iPhone OS 3.0 event video added to iTunes Store
Developers and beta testers, let us know about your experiences with this latest iPhone OS 3.0 beta in the comments.