Dion Almaer (aka Director of Palm Developer Relations and my boss) has been busy getting his hands dirty in WebOS and is starting to write about it on his blog.
Gearing up your applications to be touched and the horizontal scroll is an interesting look at some of the things you need to consider in taking content designed for the desktop and making it usable in a mobile browser.
An excerpt:
The two biggest challenges I have found so far on the design side have been dealing with the real estate available (screen size) and the touchy feely-ness of the device.
We have been trained on the desktop, thanks to the mouse as our pointer interface, to click lots of buttons. The tactile feedback that we get is the button looking depressed, but that is about it. The mouse has a lot going for it. The fact that I have a set of states due to the fact that there is a difference between having the cursor located somewhere, and having a click on that location is useful. It can be especially useful for discoverability. As a user mouses around you can unveil information “hey, if you click this button X will happen mate!” It also has the nice side effect that your hand can rest on it.