From Cory Doctorow’s blog:

NPR joins KPMG and other bastions of cluelessness by requiring that anyone who wishes to link to the NPR site fill in this form. No matter how deep or shallow your link is, NPR requires you to fill in this form.
…
Really, it beggars the imagination to think that anyone in this day and age could be this fatally stupid. If you agree, drop a note to NPR’s ombudsman.

Here is the form. Do I need to get written permission to cite an NPR program in a bibliography?