I tried playing Okami on the PS2 yesterday and I have to say, it was one of the worst gaming experiences of my life :S
A DS port could be rather good as long as they fix the glaring faults with the original. It's almost like it was made for the DS, using a stylus would be awesome. I can see a great game hiding in there somewhere, but so many things about the way they did the PS2 version irritated me to the point where I couldn't continue. Let the player set the text speed, no more crawling cutscenes, print long story text on the screen in whole blocks, bin that god awful voice sound effect, don't spend 20 mins re-telling the backstory that's written on the first page of the manual and fix the camera angle. Go on Capcom, you know you want to.