Lubuntu is an unofficial Ubuntu flavor based on LXDE.
Remember Ozone, the theme proposed to become default in Lubuntu 11.04? Well, the theme got some improvements and it's now a lot faster so it was made default starting today. Here's how Ozone looks now:
Today's update also brings a new wallpaper (well, you've already seen it when we've talked about Ozone) to match Ozone:
For those interested in using the new Lubuntu wallpaper, get it from here.