McGonagall is the spy?

[Phoenix in the Ashes]

I don't think she'll turn out to be a spy... mainly because althoug it would be an okay twist, I don't really think it would be too much of a difference to the story. I mean, so what?

McGonagall is one of the most loyal, possibly the most loyal person in the OoTP, and I don't see that there would be anything in it for her to trade sides.

[Mistress Siana]

New evidence!

There's one thing in the books I've always considered kind of a flaw: The Secret Keeper business. On her webside, JKR says that a secret continues to be protected by the Fidelius Charm, even if the persons involved die. Now, Pettigrew is supposedly the Secret Keeper for the Potters, right? No one except for him can talk about where Harry's parents lived. Now, Harry knows quite well where his parents lived, and Godric's Hollow has been mentioned a few times, when technically only Wormtail should be able to speak about it. I always thought this was a bit of a flaw. Now, rereading a bit, I discovered this: The only one to ever explicitly mention Godric's Hollow is McGonagall. She mentions it right at the beginning of the series, and it's her Harry overhears talking about in in the pub. For the others, it's always 'the place.' It's a little strange, isn't it? Flaw? Hint?