Major Nelson has posted a comparison between the old Games Marketplace and the new Games Marketplace:
This week, we take a look at the Games Marketplace. As you can tell in the below before and after screenshots, the team has done some great work in redesigning the Marketplace to showcase information about each game. In addition to seeing the downloads available for each game, you’ll also be able to look at screen shots and game details (like on Xbox.com.) The Gamerscoreblog has a more in depth post about this, but I’ve posted the high resolution versions of these (and more new Marketplace images) on my Flickr so you can see it for yourself.
As you can see, they look much better, while remaining slightly different in terms of viewing. Click “Read more…” for full size screenshots.