I thought this was interesting because it was widely believed that "ordinary" radio signals could not be detected from even nearby stars, only intense beams *specifically* targeted at us as a form of communication.
IF this report is true that clearly increases the possibility of detecting advanced civilizations in nearby stars with the upcoming radio telescopes.
However, there was discussion on sci.astro.seti doubting the conclusions of the paper:

Subject: Eavesdropping on Radio Broadcasts from Galactic Civilizations with Upcoming Observatories for Redshifted 21cm Radiation
From: Joseph Lazio
Date: Mon, Oct 16 2006 8:33 am
Email: Joseph Lazio <jla...@adams.patriot.net>
Groups: sci.astro.seti
http://groups.google.com/group/sci.astro.seti/browse_frm/thread/82752c4e1073f808/

The full paper is available here:

Eavesdropping on Radio Broadcasts from Galactic Civilizations with Upcoming Observatories for Redshifted 21cm Radiation.
http://arxiv.org/abs/astro-ph/0610377

Bob