Hey, I know a lot of people are waiting for someone to just say the £25 Snow Leopard upgrade works on Tiger. Well it does. I bought it yester and put it on my Intel Macbook running TIger and now I have Snow Leopard. Also my previous versions of Ilife all worked as did my Iwork stuff. So, I think all those who remained on Tiger have now been rewarded by a cheap upgrade - I suggest all you Intel Tiger users take advantage. N.B!! Do not mention you are running Tiger if someone asks in the Apple shop, the person in front of me did and got conned into buying the expensive pack.