I'm curious as I don't recall reading any specs that indicate any sort of hardware features dedicated or optimized specifically for anti-aliasing.
With that said, I bought Okami today and there seems to be some real-time AA going on in some parts of the game. I could be mistaken, however, but I ocassionally see things that are most certainly anti-aliased. They may just be prerendered (already anti-aliased manually by the artist) stuff that are being "moved" across the screen as it doesn't seem to be on everything...
Anyone with Okami care to share what they think?