Some of the recent improvements to the site map had been taken up another notch and we've applied all these improvements to the Webmaster Center. Now webmasters can manage the entire site map right from the Webmaster Center.
The expand all and collapse all buttons have been reduced to a pair of triangles just over the link to the Homepage. If you feel the need for more elbow room, use the icon at the top right (4 arrows - we have no idea what to call it) to get the site map on a separate page.
Additionally, we made some changes to the colors used to indicate separate and nested sections. Be sure to let us know if you like these changes.