Apple has built a new tool which will hopefully leave Apple as nothing more than an intermediary to disputes. The new "iTunes Content Dispute" tool isn't just for apps, and can be used for any iTunes content. If you think someone has infringed on your copyrighted material, you can put in a request, which will be passed along to Apple's legal team, then to the accused party. At that point, Apple steps back to allow the two sides to sort it out.
There are reference numbers in order to track communication, in case things escalate to needing real legal intervention. Overall, it seems like a good tool, and one that Google may want to install for Android. Google has also been working to crack down on ripoff apps, but more could certainly be done.