There is a flash based calendar that starts in October and goes through March. It appears that a different game is going to be filled in for each month, but currently the only month filled in is October and it is filled with Half Life 2.
ATI just put up a bunch of stuff related to HL2. Its just cause they officially acknowledged the partnership between them and valve, and they are recognized as the official card for HL2. Nothing really new on the HL2 front tho