If you were smart enough to get a smart phone in the first place, then you should be sharp enough to realize that these pocket powerhouses do a lot more than browse the Web and download e-mail. At their best, smart phones bring much of the functionality of a PC to the palm of your hand. That's because you can download literally hundreds of applications, giving your device the ability to do everything from accessing files and media from your desktop to launching your favorite Web sites by simply saying them. Since you probably don't have time to sift through them all, we've handpicked our favorite smart phone programs, many of which are compatible with multiple platforms. Whether you have a Treo, BlackJack, BlackBerry Curve, or Nokia N95, we've got your killer apps right here.