Most Java developers use Ant to do builds and are familiar with its core tasks. But Ant's tasks tend toward an undesirable coupling: everything important had to be a core task because it was hard to distribute new plug-in tasks. Fortunately, Ant 1.7's new antlibs feature makes it much easier to distribute and use new Ant tasks. In this article, Kev Jackson shows you how to use, write, bundle, and test antlibs.