I'm building an app to run on ios and android, and using phonegap as the framework (of course). Handling the technical issues is no problem.
But each platform has some UX differences on sizes, where things go, etc. I haven't been able to find any tips, cheatsheets, etc for laying things out on the two platforms. An easy example (it's right at the top) is left justifying versus centering the title, another is supporting a back button from a detail view.
With so much work being done on cross platform development, it seems like someone has to have compiled tips, cheatsheets and other patterns.