I have just updated my various WordPress installations to the new 2.7 release. I really like the new admin interface. It's sleek, simple, and doesn't get in the way. The new dashboard is much cleaner as well, and provides some nice new options. I particularly like the ability to hide certain screen elements that you aren't interested in (this is particularly useful on the "Write Post" page).

Version 2.7 now includes an auto-updating feature, which is interesting. I still think that updating via Subversion is super easy, though an auto-update feature is a great step forward for this platform. WordPress is becoming more and more robust, and I'm oh-so-glad I chose to use it.