Here is a link to the Best American Poetry 2006 Table of Contents:
Best American Poetry 2006
If you scroll down, you will see that Reb Livingston's poem, "That's Not Butter" was chosen. That poem first appeared in MiPoesias, an online journal created by Didi Menendez and edited by Amy King.
Does this mean that the online poetry community has finally caught up with print journals? Perhaps.