This is a huge boon for all the GPL software out there. The more I researched the issue, the more I realised I wasn't going to be able to release any GPL'd software via the App Store until it was lifted.
Also, I've been quiet lately - not because I've lost interest in the iPhone, but my day job has required more of my personal time lately - admittedly, the GPL issue didn't help. I have been talking to Andreas, who is the author of SIDPLAY for OS X. We are going collaborate, which should result in a great version of SIDPLAY for the iPhone. Unfortunately, we have both been very busy lately, so things have been moving slowly, but don't despair, as in the coming months I'm sure we will be able to finish off SIDPLAY for the iPhone.