Cannot really understand why people are getting excited over the fact that ATi did show off some stuff and Nvidia didnt, the only reason ATi could show off a R600 prototype is because thats exactly it......a prototype because they have not managed to get it on the shelves yet, by the time they do NVidia will already have its mid ranged 8800 series cards on the shelf so they will have like 2/3 of the DX10 market at least, by the time ATi have their mid ranged on the shelf NVidia will have had plenty of time to develop it's second generation DX10, its probably that card they really would NOT want to show ATi!
Forgetting about quality of cards (yes I agree the R600 looks better, on paper at least) for the time being there is only one company making billions outta DX10 and thats NVidia and that will continue at least until the early summer when ATi bring out their mid range cards so which company is laughing now?
Personally I am probably going to wait until ATi second generation and see what that has to offer.