Zwiki urls are fuzzy. This is similar and related to the fuzziness of FreeformLinks. What it means is that when you type the page part of a zwiki url in your web browser's address field, you can ignore case and/or type just the first few letters; it will find the nearest matching page. If no page can be found you'll get the option to create one or to do a full text search.
Fuzzy urls also work for wikis inside Zwiki and Plone sites. To enable them you must visit 'SOMEPAGE/setupDtmlMethods' as manager to install the standard_error_message handler. #1117 fuzzy urls don't work in private cmf/plone sites though.