I'm a whore for the Minoans (greatest civilisation evah!) but I'm not 100% sure about the Phaistos Disk - an American guy claimed to have deciphered it in 2001 or 2002, but to the best of my knowledge his translation hasn't been accepted by the scientific community. I was in Crete in 2003 and every museum I went to (including Iraklio, where it is kept) was still saying it hadn't been deciphered. But personally I agree with the guy who claims to have translated Linear A, because he has a strong linguistics background and sound methodology, and the translation (basically a call to arms, warning of the approach of an attacking naval fleet) makes sense and could easily be explained within the culture of the Minoans at the time (incidences of attackers arriving in fleets are backed up by several sources of Linear B, and later by Greek historians).

So I voted yes. But I think its pretty well open to interpretation; whether you believe this guy (and for the life of me I can't recall his name) or not.