Oh wow, I totally forgot this, but I was talking to a friend about Muse toady, and Electrophile's post reminded me...
I saw MUSE open for U2 back in October. They were just jamming between songs, and the guitarist breaks out in the opening riff of Heartbreaker. I freaked and was waiting for then to kick it up, but they never actually played the song, he just ran the riff for a few seconds.
I was a bit dissappointed... but then again, did I REALLY want to hear MUSE do Zeppelin?