Used mostly in
slashdot posts, this
acronym stands for "
Free Reg. Req.,
Yada Yada Yada". This usually means that a
New York Times article has been
referenced post. And to read the
original article, you will need to
register with them.
Typically if the post is more than 8 hours old, there will be an NRR link to the same article, or a cut-n-paste of the text of said article.