The Netbook version of Ubuntu, Ubuntu Netbook Remix gets a redesigned user interface. This new interface will be available in the Netbook Remix version of Ubuntu 9.10 Karmic Koala.
When you are familiar with the "old" user interface of Ubuntu Netbook Remix, you will notice the right side of the Launcher is removed & is now integrated into the left panel. Another thing which is also removed is the animation of the Launcher.
The color scheme now has a slightly darker tone, so the interface looks cleaner. Also the new interface feels more responsive now, according to the Ubuntumini.com Blog.
Look here for more pictures of the new interface.