It is what Shootall described.
I've seen it and had it forwarded to me from a friend. It describes the declining birth rates of several countries and societies and indicates the birth rate required to perpetuate a country/culture/society. It compares the declining birth rates of non-muslim countries to the growing muslim birth rates and projects how many years before muslims become the majority and gain political control.
The projections over the next 20 or 30 years would be very frightening -if you fear a muslim-dominated populace (I do) and if they are correct. (I don't know, and am very skeptical) I tried to corroborate some of them with the CIA world book of facts, but didn't find a direct comparison.