iOS UI Development

1. iUI: iPhone User Interface Framework
   iUI is a framework consisting of a JavaScript library, CSS, and images for developing advanced mobile webapps for iPhone and comparable/compatible devices.
   Create WebApps with an iPhone-like Look and Feel
   iUI has the following features:
   
   1. Create Navigational Menus and iPhone-style interfaces from standard HTML
   2. Use or knowledge of JavaScript is not required to create modern mobile web pages
   3. Ability to handle phone orientation changes
   4. Provide a more "iPhone-like" experience in your Web apps 
2. WebApp.Net
   WebApp.Net is a light weight, powerful javascript framework taking advantage of AJAX technology. It provides a full set of ready to use components to help you develop, quickly and easily, advanced mobile web applications.
   
3. jQTouchA jQuery plugin for mobile web development on the iPhone,iPod Touch, and other forward-thinking devices
4. UiUIKit
   If you are looking a CSS framework to develop iPhone web applications you may check this project.
   The UiUIKit (Universal iPhone UI Kit) it's a collection of HTML examples of what can be done with CSS3 and Safari's Webkit. With this framework you can:
   Fast prototype any web app with ease. Make you're own app using diferent iPhone original interfaces.
   
5. QuickConnect
   QuickConnect is a powerful, modular, simple to use, application development library available for many languages and platforms. QuickConnect is currently available for: iPhone, Android & Mac JavaScript apps, Erlang/Yaws, and PHP.