Pilgrims Progress 12 week Children's Church curriculum
Kidology Open Source 3 full years (120 weeks!) of free curriculum! 1 year chronologically through the OT, 1 year chornological through the NT, and one year of Biblical values tied to Bible heroes. Requires a free membership registration.
Max7.org is a free open source resource for children's ministry. Lots in English and Arabaic is the word on the street.