Jax has lots of potential, in part because it’s designed to be expandable; JoeSoft promises “dozens of new Jaks” that will be available as free downloads. However, much of the potential rests in a hope that JoeSoft will make much-needed bug fixes and improvements in functions that the existing modules don’t do well enough. This is likely to take a while, if recent development is any indication: the product was released in late June has just had one revision since then. The company says version 1.02 should be available around the time Leopard (OS X 10.5) is released. If you find the current features appealing and have some patience, give Jax a test drive; if not, you may want to wait for a major upgrade before buying.