Please remember that to qualify for airdrop there are two steps you must follow as said in the op.

1. Change signature
2. Send us a PM (this makes it easier to keep track of sent coins)

Many users are just posting here after changing their signature, you will not get any coins unless both steps are followed. Also remember please DO NOT POST ADDRESSES in the thread this is against forum rules when it comes to giveaways. Feel free to post here that you have received coins if you like though, or any ideas you have to share.