It's been three months since AMD and ATI made the nasty, and what do they have to show for it besides a big mess and the broken hearts of nVidia and Intel? Something called the "Fusion", a CPU/GPU hybrid chip.
Thanks to their respective expertise, ATI and AMD can come together and make a CPU that's capable of handling many GPU tasks. Instead of offloading graphical functions to the card, which then has to be piped back to the CPU for additional computation, many things can be done "in house", saving time and making your apps faster. These Fusion CPU/GPUs aren't going to be available until late 2008/early 2009, so whatever you purchase now should be safe from obsolescence until then.