The Confluence Importer has been deprecated as a means of importing Wiki data into FogBugz. Instead, we recommend using our fully documented API, which lets you perform almost all of the actions you can in the web UI from a script or application. You can find full documentation here: http://help.fogcreek.com/8202/xml-api
The calls are simple GET or POST requests containing key/value pairs, so you can use it from any language or platform. All responses are in XML format. To make it easier, we wrote a Python wrapper. We have some tutorials here and a link to download the code:
There are also libraries written for php, .NET and others available at http://www.fogcreek.com/fogbugz/extras/
As always, our support team is happy to help. Email firstname.lastname@example.org with any questions you have.