Crafting Co-op Jobs were introduced in limited release on September 23rd, 2010. Users can only create jobs which correspond to their Crafting Building, however can join any of their neighbors' crafting co-op jobs. The main reason to do these jobs is because on completion, you'll be rewarded with an entire item's worth of bushels. Ideally, users will use the rewards on Level 5 crafting jobs which require 4 different types of bushels to complete.