1
When withdrawing using Mt. Gox, one of the checkboxes is marked "Open Transaction" and it shows that this requires "6 Confirmations".
This is used if you might be paying another Mt. Gox account but want it to go through the blockchain rather than as a transaction handled internally by Mt. Gox and thus no corresponding transaction in the blockchain is made.
Since the input for the transaction is coming from Mt. Gox's own wallet, there is no concern over double spending. Why would Mt. Gox require six confirmations for these if the recipient is another Mt. Gox account?
2The only reason I can think of is to not give a clue to the recipient that you also are a Mt. Gox user, but that could be discerned fairly accurately from the blockchain addresses. – Stephen Gornick – 2012-08-03T23:51:48.240