Pearl Jam
Pearl Jam is back with a new album that includes some great protest music. Here's the band performing the new song "World Wide Suicide," on SNL. (h/t Daniel)
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Eddie Vedder was interviewd in Rolling Stone and talked about the song:

Q: Why do you think the musical community has been so quiet recently about the war, about the president? Or maybe you don't think that?

Vedder: We could talk about Democrats and why they aren't leading an anti-war movement. Are they waiting for a shift in the polls? We could talk about our country in ways outside the war, like why they refused to sign the Kyoto Protocol, in regard to environment. Why aren't we agreeing to strengthen the conventions on biological weapons? Why haven't we signed the ban on landmines? Why haven't we banned the use of napalm? They refuse to be subject to the jurisdictions of the International Criminal Court. They can get away with anything. If you highlighted the classic aspects of this war, find out who's fighting and who's dying, and why are there billions of dollars being spent on this war and schools are crumbling and 45 million people in the US don't have health insurance...read on"

You can buy the album here...There's also another video of the song "Life Wasted," on the Amazon page.