I love how easy it is to keep up with the latest and greatest of a plugin in Rails: `script/plugin install -x https://some.subversion.server/plugin`.
Unfortunantly, if you then want to remove it, you need to then go and muck around with subversion externals in `/vendor/plugins`. It took me much hunting around and playing with svn proplist and svn propget to figure it out. It turns out to be as simple as just
cd ./vendor/plugins and then svn propedit svn:externals . –editor-cmd vi
and removing the line. Then just commit the changes plugins directory!
The canonical information on properties is available from the [Redbook](http://svnbook.red-bean.com/en/1.0/ch07s03.html)