One thing about Google is that they are always busy making changes!
This week the big G is in the process of migrating older Adsense accounts into an upgraded interface. This move also gives publishers the opportunity to integrate multiple Google accounts
(GMail, Adwords, Picasso etc.) into one single login.
For more information on these changes, please visit the Google Adsense Blog.
Thanks for posting here the useful information i didn’t know that.