I just logged into my Adsense and Adwords accounts and was asked to switch my login identity to a Google identity – (ie my Gmail account login). This enables me to log into a number of Google accounts with the one login – a more integrated system by the looks of things.
From what I saw they were going to require all publishers to do this by January 15.
This is something I’ve seen a number of Adsense publishers requesting over the past few months and it looks like they are gradually prompting all publishers to do this (there is a thread at WMW here abut it).