Romenesko points to an exploration of the mysterious animus towards Starbucks. I tend to just not like the ambiance all that much, but I've always found it sort of weird that activists concerned to right global injustice can devote so much time and energy to a coffeeshop. Anyway, one of the few really good libertarian-themed songs is the "anti-anti-WTO" anthem "Busting up a Starbux" by former Soul Coughing frontman Mike Doughty, in which he pokes fun at trendy protesters. You can hear it on his most recent album Smofe and Smang.
Jackson Kuhl wrote about Starbucks hate in the January 2003 issue of Reason.