The AdSense Publisher Toolbar is now renamed as "Google Publisher Toolbar," as it now supports DoubleClick for Publishers as well.
The Google Publisher Toolbar basically a Chrome extension that help you save time and monitor account performance directly from your pages.
Google says, it is now used by over 31,000 publishers, and is now available in all AdSense languages. Today, Google announced some enhancements tot the toolbar -- Note, if you're already using the toolbar, no action is needed on your part as it'll automatically update.
First up, and probably the biggest improvement is the addition of the ability to blocking ads as you're viewing your site. "When you see an ad that isn't suitable for your audience, you'll be able to take action immediately without needing to navigate through your account or investigate which ad or URL to block, informs Google.
Here's how it works?
Once you've installed the toolbar: "you can view account performance in a widget in the corner of your Chrome window, as well as ad overlays on the page itself. Clicking on one of the ad overlays will now bring up additional information about that ad unit, including the name of the ad slot, performance metrics, the destination and display URL of the ad, and a preview of the ad. Below the ad preview, you can take action on either the ad or the URL: If you are using the Ad Review Center, you can choose to block the ad directly and your action will be reflected the next time you visit the Ad Review Center. If you block a URL, it'll be added to your URL filter list," explains Gregory Block -- AdSense Engineering.
Gregory notes that "clicking the ad overlays generated by the toolbar is permitted, and won't generate any invalid clicks."
And, keep in mind that blocking any ad will lower your potential earnings, as it reduces competition for your ad space by removing advertiser bids from the auction.
He also debunks the myth that filtering ads can prevent 'low-paying ads' from appearing, and recommend blocking only those ads that you feel are unsuitable for your users.