Novell has set up a website that is the product home for ZENworks. This website is http://www.novell.com/products/zenworks. From this website, you can find Novell's online documentation and announcements for updates to the product.
Additionally, from this page you can follow the links to http://support.novell.com/products, where you can find any patches and fixes that may be released for the product. ZENworks products are found under the NetWare and the Management Products categories.