Hide and seek: With ‘hide‘ function, you can avoid displaying ad units you prefer not to see on your Manage Ads page. Just click the ‘Hide’ link associated with a specific ad unit in the Actions column, and the ad will no longer appear when you view your Manage Ads page. Hiding any active ad unit won’t prevent it from generating revenue for you, and you can view your hidden ad units at any time by checking the box that says ‘Show hidden AdSense units‘.
Channel IDs for all: In addition to AdSense for content, you can now view the custom channel ID numbers associated with other AdSense products (e.g. AdSense for search and referrals). Visit the Channels page under the AdSense Setup tab, and select the tab corresponding to the product you’d like to view.[AdSense Blog]
Google, AdSense, AdSense Ads, New Features, AdSense Features