I'm planning to that, unfortunatly havent started yet. hopefully in the next month. whenever you get it to work, let me know. there are also other Game Center ANE's which are pretty easy to understand. just search for it, otherwise i could PM you if you are interested
yeah I think Milkman Games has an ANE file. I thought the Adobe one might be better, plus it was free so I figured that would be the easiest to get up and running. but it seems all I can find are tutorials for FlashBuilder, not Flash Develop, which is what I use.