Although some designs are probably too late to save — cough, Orkut — Google did a very nice job redesigning their AdSense entrance page. The old design (taken from Google’s cache) sports the same super-low-quality thumbnail that’s always been there, along with their oh-so-boring layout.
The new design is much cleaner and tight. The fluid layout has been replaced by a thin fixed layout, and the images finally use a decent quality. The Sign Up button is prominent and the description has a subtle AJAX-like tabbed content panel.
Google appears to have taken the new design offline and replaced it with the old design. It could have been a publishing fluke I suppose or they found some things they needed to tweak. When I saw the new design it looked ready and refined, so I expect them to put it back online again soon.
People are getting different results depending on the network they’re on. It’s looks like a network/redirect issue. Regardless, you can access here: google.com/adsense/login