You’re not alone here. I’ve been working on a PHP/MySQL/AJAX project for the past year or so. Like yours, it’s catered to the iPhone/iPod Touch interface. I haven’t “open sourced” the project yet but would be open to getting someone else involved in it if they wanted to help. Sounds like you’re going more the java direction so this may not be applicable to you & I but if anyone else out there is interested, let me know.