WebOS SDK to be out by the end of the summer. WebOS 1.0.3 out now
Although the Palm Pre is available for purchase as of June 6 (only from Sprint at the moment), the WebOS SDK (software development kit) is not yet released to the public.
However, Palm said that the SDK might be available by the end of the summer.
Palm has also announced that WebOS 1.0.3 is now available for all Pre owners. The software update brings stuff like enhanced Google calendar syncing, enhanced email capabilities and updates to several applications.
Here you can read more about how to update WebOS on your Palm Pre.