To make an app for the Palm you should use HTML, CSS and Javascript. But then, I ask, why not use these same technologies and tweak a little your app into a generic Web application, available also for iPhones, Androids and Blackberries? Why would I want to limit myself only to Palms?
self-update: there's apparently some plugin development kit that will allow OpenGL ES access.
"We have been working closely with a handful of partners as we refine the PDK's design and initial implementation, but we'll be expanding soon. A public beta release of the PDK is scheduled to be available to all webOS developers in March, followed by an official release in the first half of 2010."
To make an app for the Palm you should use HTML, CSS and Javascript. But then, I ask, why not use these same technologies and tweak a little your app into a generic Web application, available also for iPhones, Androids and Blackberries? Why would I want to limit myself only to Palms?