I have read some years ago that, according to the results of a survey in a Western country (I think it was Germany), the number of people who admitted praying occasionally was far superior to the number of believers in any kind of god.
When I read ancient prayers to the gods or goddesses in a polytheistic context, I notice they are not very different, in form and in content, from the prayers to the monotheistic "God". Many of the Bible prayers (e.g. Psalms) have probably originated in a polytheistic context, even though we now read them as prayers to the one and only God. In other words, prayer is older than God, and perhaps than the gods. And the "death of God" doesn't necessarily mean the end of this particular form of expression we call prayer.
Although I do not believe in God anymore, I still "pray" from time to time. An excess of anxiety, or joy, can lead me to "prayer", although I do not imagine anyone "listening to me". It's pretty irrational OK, but I guess prayer always is. When a consistent Calvinist prays, for instance, while believing that God has foreordained everything before the foundation of the world, he does something pretty irrational too. He may believe that God also foreordained his prayer, but this is hardly a motivation for his action.
So my question (especially adressed to fellow unbelievers) is the following: do you still feel like praying from time to time? Do you indulge in such irrational "prayer", or repress the "urge to pray" because you deem it inconsistent with your world view? How do you rationalize this experience -- if you do?