To anyone interested:

JKR's site door opens again. Okay, don't get over-excited because she still hasn't set a date for the release od the sixth book but at least this kind of helps kill time.

If you're at a loss at some point, just head for the Mugglenet comments and either read the steps in order to go in or what there's behind the door. But be careful in case you want to just follow the steps - the comments are full of spoilers!!