Burden of Proof - Who has it?

In this episode, blogger Sacerdotus addresses the burden of proof and who has it.  Atheists often claim that those who believe in God, or theists, hold the "burden of proof."  The burden of proof means that one has the obligation to defend his or her claim.  Atheists shift the burden of proof on theists in order to excuse themselves from defending their claim of non-existence of God.  Sacerdotus explains what the burden of proof is exactly, how it works and who has it during a discussion or debate.