The guy who writes for the Pikesoft blog used to be a Palm developer. He stopped blogging about a year ago, I never bothered to remove his RSS feed from Google reader, and he just pumped out two highly technical posts about the inner workings of the Pre based on the screenshots of the SDK that Boy Genius posted.
Check out his blog posts here:
1. http://www.pikesoft.com/blog/index.php?itemid=207 titled "Is that a Java application server running on your Palm Pre?"
2. http://www.pikesoft.com/blog/index.php?itemid=204 titled Palm webOS applications are not "web apps"