The Breathe icon team just announced their initial release. Check it out if you haven't seen it yet on the ubuntu wiki or on gnome-look.
They've come a long way and are moving ahead at a steady pace. Breathe is an excellent example of the ubuntu artwork community's "theme team" model and proves it's effectiveness and strengths.
Breathe is a growing team and is always looking for new contributors. Specifically, they're looking for someone to help with releases and so forth, so any developer with some free time would be highly appreciated.