The infamous Athlon X2, which for a long while was king of dual core until Intel released Core architecture CPUs, is being phased-out. As AMD begins to focus on the Phenoms and the Athlon 6000 architecture, and starting soon they will no longer manufacture or take orders for the X2 series processors.
This includes their latest (and probably last) iteration of the X2, the X2 6400+ Black edition, though some revamps of older CPUs like the 4600+ are still in the works. I certainly hope that their concentration on Phenom will help them recover from the past two years, in which they have been beaten again and again by Intel.