Today is a very sad day for a lot of small developers as they can't submit their applications or plugins to the new Mac App Store as they don't meet the requirements.
This is what Apple had to say:
"Thank you for making the Mac OS X Download site a great destination with apps that offer users new ways to work, play, learn, and create on their Mac.
We recently announced that on January 6, 2011, the Mac App Store will open to users around the world, presenting you with an exciting, new opportunity to reach millions of customers. Since the introduction of the App Store in 2008, we've been thrilled with the incredible support from developers and the enthusiastic response from users. Now we're bringing the revolutionary experience of the App Store to Mac OS X.
Because we believe the Mac App Store will be the best destination for users to discover, purchase, and download your apps, we will no longer offer apps on the Mac OS X Downloads site. Instead, beginning January 6, we will be directing users to explore the range of apps available on the Mac App Store."
So there you have it, the re-vamp kills off the Mac OS X Download site from January 6, go there while you can and take advantage because the clock is ticking down.