For those who are interested, I’ve moved my navigation helper Rails plugin over to GitHub.
http://github.com/rpheath/navigation_helper/tree/master
You can follow the changes there if you’d like. To install (from your project root):
git clone git://github.com/rpheath/navigation_helper.git vendor/plugins/navigation_helper
I doubt I’ll be pushing changes to the subversion repo anymore, so use the above method if you want the latest and greatest.