ATI was already known for a few weeks, but now it is official that Asus is going to carry ATI cards. Asus is going to launch cards of the Radeon 9800 XT, 9600XT, 9600SE and 9200SE family.
ATI today announced that ASUSTek, a world leading supplier of graphics add-in-cards, has chosen ATI’s RADEON™ VPUs (visual processing units) for its new line of products. Beginning in October, customers will be able to choose the fastest and most advanced graphics cards from ASUS, which is well recognized and trusted by computer gamers everywhere.
X-bit Labs has some more information on which ATI based cards ASUS is going to launch :
As you see, ASUS' Powered by ATI lineup only consists of five models, while the previous NVIDIA-based family offered tens of graphics cards. This means that RADEON product line is not here to substitute the GeForce lineup, but to complement it.