Prior to version 6.0 Safari had no features for managing passwords distinct from the system wide support provided by Keychain:

but Safari 6.0 adds a new tab in its Preferences dialog for saving and managing passwords for websites:

Does this change correspond to a change in locations for storing or rules for managing the security of passwords? Are Safari passwords still stored securely in the Keychain or are they in a new, separate store?
Where are Safari 6.0 passwords saved?
