I am right there with you as well. I have three Wyandottes that are 21 weeks old and four Ameraucanas that are supposedly two months older than them. (I suspect the Am's are actually younger but I really don't know) Not a single stinking egg yet!
DH wants to take a beer can out and show it to them as an incentive.
I know the Wyandottes are getting close since their combs and wattles have gotten pretty big and red. The "older" Am's? Well lets just say they are not nearly as close! I was sure that someone would start laying last weekend since we went out of town and had a friend taking care of the animals for us. Figured she would have the honor of getting the first egg but still nothing.
Between getting my first chickens, building the first coop, getting some more chickens, buying their coop and then building a coop big enough for all of them to live together I figure my first egg will cost around $2000 if I ever get one!
In the mean time they just blissfully come running their eggless selves to me whenever I get the treat bucket out!