Our church is unique in that our Sunday School is all in one. There are no grades and not too much room to separate even if we wanted to, but I believe that a strong Sunday School makes for a strong church. Thus, as usual, open mouth and instead of inserting foot, I add a commitment to my calendar. I also kind of believe that if you are going to complain, you better be willing to do something about it. Therefore, I am on the committee to help out with the Sunday School.
This year we started working with an online curriculum called The Whole People of God. The unique thing about this program is that you pay according to the number of people in your congregation. It is available all online which means that we can have multiple people access the curriculum and no one can forget to pass the book along. They are lectionary based and have lessons weaved throughout the congregation. We even took our Christmas Pageant from the curriculum with some adaptations. They have multiple levels to pull from, but since we teach the masses, I usually just use the Primary level and adapt from there.
If you are looking for a curriculum to use, after several months now of using it, I can highly recommend The Whole People of God. Now, I can only pray that they don't stop publishing like the last one I really liked, BibleQuest.