Harry Potter and the Deathly Hallows discussion thread (SPOILERS)

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I loved the book, but I'm still trying to figure out how Dumbledore's portrait knew they switched the date for Harry's departure. I spent the whole book thinking there was a traitor in the Order, and it turns out Snape's source is Dumbledore!?



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Snape's source was Mundungus Fletcher. We see that when we go through Snape's memories.

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Hmm...I read that as Dumbledore (well, his portrait) coming up with the idea for the seven decoys and telling Snape to plant that idea with Mundungus. I didn't draw from that that Mundungus was feeding information to Snape all along.