i know that WFMU has been very proactive about any kinda move against them by the RIAA. the free music archive is a response to that, in addition i have seen a list of musicians that allegedly have never been paid by the RIAA, and someone in a FMU blog said that those musicians would be fair game to play over the internet. in addition to that i believe that FMU has been working to get permission from artists to play their music without having to pay any riaa fees.
i also remember that Ken addressed some of these problems in the State of the Station address a year or two ago.
http://www.wfmu.org/playlists/KF2007 check out the March 10th show.
as far as pandora i say good night sweet prince. i saw the founder Tim speak a few years ago and i asked him a question about internet broadcasting and what they would do, if at the time, the riaa passed the new fee scale. he said something along the lines that it would not effect them since they make enough money... well i guess it turns out they did not make enough. the guy seemed like a smug jerk. also he said that Steely Dan was his favorite band, im not kidding....