Now Palm is trying to make up for lost time with the Palm Pre, a $200 touch-screen smart phone with a sliding keyboard that many observers are touting as the first device able to go mano a mano with the iPhone 3G. Palm decided to embrace the challenge by scheduling the Pre's release on June 6, just two days before the start of Apple's Worldwide Developers Conference in San Francisco, where Apple is expected to unveil the next generation of the iPhone.