I thought I'd start with this post. I have learnt lots just reading all the posts.
Who here has perfect pitch? I have perfect pitch because mum taught me to read at 2.5 years old. It always works. All my brothers and sisters (1 brother, 2 sisters) have perfect pitch. I know someone that has perfect pitch but no relative pitch which means he can't sing a song in a different key...(freak). You need to have both if you want perfect pitch to have more uses that just a party trick.
Perfect pitch helps me play a song on the piano in any key immediately. Also, if I hear a rift I like I can immediately play it on any of my instruments. If you have perfect pitch but you can't do some of these things, you need to develop relative pitch (which is pretty easy if you have pp).
Let me know what you think about it all!