/me googles
programs that can use nzb files
http://www.newzbin.com/ and
http://www.leukemail.nl/nzb/ seem to be a link sites.
I rarely use binary newsgroups because you are limited to whatever files happen to currently be in your newsserver.
These nzb links are only going to work for a week or two after being created. They don't appear to contain filehashes so you can't be certain you are getting the original file.