Apple's iPad isn't yet distributed or available (that begins April 3), but a hacker claims he's already developed software to unlock (or "jailbreak") the portable device. From a PCWorld story:
Some of you may want to jailbreak the iPad just to customize your device in ways that Apple doesn't allow. Jailbreaking the iPad would let you change your homescreen background or install visual themes; remove standard Apple applications that are otherwise not removable, such as Stocks or Weather; or maybe even to to use Wi-Fi stumblers, a type of iPhone app that was recently purged from Apple's App Store.
Those may be nice features to have on the iPad, but they are hardly compelling enough to encourage widespread jailbreaking -- especially when the iTunes App Store will likely be flooded with iPad applications in the coming weeks. Not to mention the fact that you can use almost any iPhone app on the iPad as well.