It's safe to say from wandering around the web the hottest launch title is Resistance: Fall Of Man. Not necessarily mine (I tend to suck at FPS games).
For me two of the hotter titles are Ridge Racer 7 and Full Auto 2. Ridge Racer was my game of choice to christen my original PlayStation back in '95. I tried a demo of the original Full Auto and liked it, although i didn't buy the full game. Reportedly improvements have been made for the sequel so I'll be checking this one out when it does arrive.