Dutch broadcast station VPRO's website is Holland’s biggest platform for alternative music. Here's a link to a shitload of streaming live concerts and tracks. You'll have to do a bit of cut and paste once there, but it's the easiest way for me to link to the list. For the cut-and-paste-inept, there's a standard interface, but the site's not in english.
KVRX, University of Texas' radio station, has an archive of tracks recorded live in their studio. Artists include The Magnetic Fields, Brian Jonestown Massacre, Broken Social Scene, Devendra Banhart, Explosions in the Sky, Sebadoh, Mojave 3, Okkervil River, Japancakes, Call and Response, Super Furry Animals, Cat Power, I Am The World Trade Center and the sublime Paul Burch, among others.
Tonight, I saw (for the 4th time) one of the greatest live bands on the planet: Sweep The Leg Johnny. They played to a half-empty room in Toronto. Recently, the band put out their fourth CD. Sadly, they're calling it quits after this tour. What are some of the bands you've told folks to Go see now!, but no one seems to listen?