Unfortunately due to technical issues the April's update of Panoramio photos in Google Earth has been postponed to the end of May. The last weekly update was on April 25th adding photos up to ID 20980000 to Google Earth. The difference between the weekly update and the monthly one is that new added photos are displayed only in very low zoom levels in the weekly update. You have to wait until the next monthly update to see photos in different zoom levels according to popularity.
We added a new question to the Help page called "Spam in comments". The idea is to discourage campaigns of comments for the Panoramio contest. Sending hundreds of comments with links is simply spam. If you get spam I recommend you to add a comment to one photo of the spammer including a link to that question. Normally after receiving one or two comments the user doesn't spam anymore. This solution is far from perfect, but in the near future we will add a way to report comments and block users that abuse comment. By the way, this new policy starts now, so it doesn't apply for comments made before May 7th.
I also would like to clarify that the final winners of the contest are only the ones included after the announcement in the blog. The contest page might be technically available before the announcement, but we always need some extra time for technical tasks and verifications.