Mobile application store GetJar announced on Twitter a few hours ago that Opera Mini has been banned from the store:
Due to violations of our T&C's Opera Mini has been banned from GetJar.
This is apparently due to the recently announced Opera Mobile Store, which is available from Speed Dial in Opera Mini.
TechCrunch posted an upcoming blog post by Patrick Mork, Head of Marketing at GetJar, which says that they don't have a problem with Opera's link to a competing app store in principle, but in practice, "consumers might start using this app store instead of visiting GetJar".
It should be noted that the official statements from both Opera and GetJar indicate that the two companies do want to come to an agreement, so that GetJar fans can still download their favorite browser from the site in the future.