Largehearted Boy has been nice enough to post downloads of Bonnaroo performances as they become available here. I haven't had much of a chance to check these out yet - but it looks like you have sign up for the websites to gain access to the gold. No time for that now - my current focus is packing for Greece and trying to decide how many extra t-shirts I need to bring.
Ben Harper, Flaming Lips, Hold Steady, Wolfmother just to name a few. It'll be at the top of my to-do list when I return to the states.