The AdSense interface has been modified. It is much cleaner and more straight-forward.

You will need to review the new agreement and change your bookmarks. The old bookmark no longer functions (if you had it bookmarked with a password save). - /reports-aggregate is now report/overview

The new interface makes it much easier to navigate your reports - which makes it much easier to spot patterns for optimization.

The basic interface has an overview of content vs. search and quick links to the most popular advanced reports. I am not sure if there are more substantive changes - I have not noticed them - but I think this could be a great step forward to understanding and maximizing Google AdSense potential.

The changes also mean that the AdSense Notifier plugin for Firefox is broken. Hopefully a new release will come up soon to fix it.