Well, after a weekend of hacking, I have some basic ticketing working. You can see what I've done on the demo site.
At this stage you can't upload attachments, but that's the next step. After I've sorted that out, I'll be implementing the e-mail notification system, which will notify you of anything assigned to you, or anything you create or edit.
I've also "wikified" a number of the text fields, so you can put wiki text into some of the description fields, and it will be rendered correctly.
One I have done the attachments, and some basic e-mail sending, I'll be releasing version 0.1.3. After that I'll probably look at a proper e-mail notification system where users can subscribe to various notifications.
