"Ghajini is not a copy of Memento. The concept of short term memory loss is the same and therefore so is the fact that the character writes things to remember them (on his body, on his walls, on paper etc.). The story and screenplay is totally different. You can hold me to this." -- Aamir Khan at his blog.
And thanks to fellow Aamirian Skorpionchik for this video:
PS: These CNN-IBN folks should read Aamir's blog! :)