FCC pictures of the brand new iPod touch's internal tech show that the device has a vibrating motor inside of it. According to Apple, the motor will be used with FaceTime, but presumably, it'll work when any app calls for vibration. That should help for gaming -- neither the DS nor the PSP has any sort of vibration feedback, and that's a feature that has become more or less standard on game consoles.
This also brings the iPod touch in line with most of what the iPhone has. Besides the cell service (obviously), the GPS, and the mute switch, the iPod touch really is, as even Steve commented at last week's event, "an iPhone without the contract."
Update: According to iFixit's teardown of the iPod touch, the component identified is actually a microphone and not a vibration motor. Mac Rumors points out that Apple has updated the iPod touch's FaceTime page to remove all reference to vibration. It appears vibration continues to be an iPhone-only feature for now.