Addison, I don't have an iPhone/iTouch but I would really appreciate your feedback on best implementations out there.

Also, what about having releases for Maemo 5/N900 and Ubuntu at the same time? If it's not much extra work. It is useful to get testers (now most people in this thread don't have an N900) and also good to keep in mind the cross-platform strategy, even if currently having a full supported desktop version is not a goal.