I've written a short essay about anti-features. An anti-feature, I argue, is functionality that technology producers charge you to turn off. Apple's new, "pay-more to get DRM-free" is one example of an anti-feature but one can find them everywhere.
It's a quick read and, I believe, an important but largely missing argument in most free software advocates' arsenal. I've posted it the on the FSF blog here:
http://www.fsf.org/blogs/community/antifeatures
