Although The Fluke deserves consideration, and all things being equal Earth Day probably should get my vote, I saw DTB live here in Vancouver about a month ago, and as a result, had to vote Deep Peace. At the show, they started with Away from AE, then Dev cut into the guitar solo on Deep Peace and played the song out from there. With the possible exception of Mikael Akerfeldt playing "Benighted" live as a (mostly) solo effort, it was my favourite concert moment ever. Sooo... Deep Peace!