The Palm Pre Mojo SDK will become available by the end of summer, which means developers will have to wait for a while to create applications.
However, according to an article on topnews, the hacker community are hard at work creating jailbroken applications for the Palm Pre similar to the jailbroken iPhone apps.
Palm has built a developer friendly webOS enabling developers to create mobile applications using JavaScript, CSS, HTML and other web standard coding, but the Mojo SDK is still necessary for creating official applications for the Palm Pre. Palm has also stated that Mojo based apps will be way better than any jailbreak app or hacking attempts.