Yeah, its been awhile since I released XUL Explorer 0.7 and at the time there was a bad editor bug in Mozilla trunk, so I released using an older version of XULRunner. However, the bug has been fixed, so I made some small tweaks & fixes and will release XUL Explorer 0.8 using a XULRunner 1.9b2 pre-release.
Besides the editor bug fix, I wanted to use XUL Explorer to demo some of the new features that landed, including the cool new XML and SQL based XUL templates.
Download from here.
Update: See this post for XUL templating examples using SQL (mozStorage).