None of these will play nice together. It's not in their perceived best interest to do so.
The best bet is to dumb everything down and keep it simple. Simplicity always wins when you are trying to sandbox multiple hostile interests.
Look to XML for all data, and then have 5 binaries to read it or push it all to a web server via PHP. All these mobile platforms will function nicely with XML because it's in their best interest to do so. Worry about branding and appearances AFTER you get the core functionality off the ground.
NOTE: Javascript is the last thing you should be looking at in the beginning. It rarely plays nicely on all platforms in the same way. So make sure that your JS layer is independent of your data layer. DO NOT INTEGRATE THEM. That would be bad. You want your Android JS to be potentially different than the JS you push on the Blackberry for example. Because you won't know how quirky it will end up being until you try it out and test your methods.
