Noise 2.0 is the evolution of the noise genre into a more interactive format.
Where noise bands blast their audience with a wall of noise from behind a P.A. system, noise 2.0 bands tend to engage with their audience and thrive off "user generated content" in the same way as websites like Facebook and Twitter.
There is a strong link between noise 2.0, flash mobs and crowdsourcing.
I saw this noise 2.0 band last night - the guy really got the audience going. We were chanting and yelling - there was a real feedback loop and I felt like part of a libidinous community, not just like I was seeing a band.