The problem with eugenics (aside from the laundry list of human rights violations) is by what criteria do we judge? How does someone like Stephen Hawking fit into this? Mentally brilliant but physically disabled.
However, on the other hand, its hard not to look around these days and come to the conclusion that some people just shouldn't be having kids. Idiocracy anyone?

They did this with Star Wars Episode III subtitles a while ago and the result was equally hilarious.

http://antibody-software.com/web/index.php?option=com_content&task=view&id=18