I bought a Polaroid PoGo and also ordered this 70 pack of Zink paper with it. I was slightly concerned about the whole issue of expiry dates, after reading reviews on here and elsewhere - and, as predicted, when I received the package on 5 January, the date on the paper was end of Jan 2010!
However, the next day I phoned IJT (the supplier) and had a chat with a *very* kind and helpful man. Two things to note:
1. When I first started printing photos, my first few prints were horribly streaky, and I was really disappointed. I told the man this, and he told me that if I notice that a print hasn't come out great, run the blue card through on its own 2 or 3 times before printing any more, and this cleans the printer head. I did this and it worked! No more streaky prints!
2. I asked about expiry dates, and he said that the only reason they have expiry dates is because the EU classify the Zink paper (as with all ink cartridges) as a "consumable", and therefore by law they must put an expiry date on. However, he confirmed that the the Zink paper DOES NOT EXPIRE, because the crystals on the paper are activated by the heat from the printer, and they do not deteriorate in any other way (he really sounded like he knew what he was talking about). Hence - ignore the expiry date on the paper.
He also said that if I do find any problems with the paper after January, they would be happy for me to send it back and they would replace it.
Hopefully that is useful for some customers who are worried about it.