I'm looking for some good resources on mobile form design. There seems to be a lot for web forms, and a lot of that translates well. But a lot translates poorly when you have restricted screen real estate.
I've heard that Luke Wroblewski is working on a new book on mobile forms, but I haven't been able to find anything on it.
What have you found useful in designing mobile forms?
Edit: I'm not asking for general form design rules, but more those that are specific to mobile limitations and different from standard web forms.