For example, I've wanted to use JS::JSLint as part of a project test suite for several years. I've never managed to get it to install. On two occasions I've spent a whole morning messing about with it and given up.
Part of the problem is that Spider Monkey is difficult to install and is not provided as a package on many Linux distributions.
I've never actually got as far as JS::JSLint!
That would be great.