You may have noticed a new menu item at the top of the page titled "Go Pro!" This is for those who want to access bonus content on the site. If you click that link you'll see a list of features available to people who have a pro membership.
Currently you can't set up a pro membership on the new version of the site (but your pro membership will carry over from the old version of the site, if you have one there!)
On the old version of the site, the primary feature of Pro Membership was the absence of advertising. On the new version of the site, Pro Membership carries far more features. One of the features we'll be rolling out soon is the personalized toolbar, which will replace the advertising column on the left. Here's what it looks like:
You'll want to click on the image to view it full size, and get a good look at the toolbar. At the top of the toolbar is the area for bookmarks. Any time you're on a page that you know you'll want to visit repeatedly, click 'Add Bookmark,' edit the page title if you want to, and then save.
The next section is the "What's New" section, which lets you see at a glance any new blog posts on the site, as well as any new problems posted.
After this is the area which will display your ratings on the various games you play, followed by the games in which you have a high score.
The toolbar is not yet available, but soon it will appear for members who have a pro membership!