jQuery Mobile

Touch-Optimized Web Framework for Smartphones & Tablets

jQuery mobile framework takes the "write less, do more" mantra to the next level: Instead of writing unique apps for each mobile device or OS, the jQuery mobile framework will allow you to design a single highly branded and customized web application that will work on all popular smartphone and tablet platforms, it supports

• IOS
• Android 
• Black Berry
• Bada
• Windows phone
• Symbian
• Meego etc.

Cross-platform & cross-device 

jQuery mobile framework takes the "write less, do more" mantra to the next level: Instead of writing unique apps for each mobile device or OS, the jQuery mobile framework will allow you to design a single highly branded and customized web application that will work on all popular smartphone and tablet platforms.

Touch-optimized layouts & UI widgets

Their aim is to provide tools to build dynamic touch interfaces that will adapt gracefully to a range of device form factors. The system will include both layouts (lists, detail panes, overlays) and a rich set of form controls and UI widgets (toggles, sliders, tabs)

Better themable designs

To make building mobile themes easy, we’re dramatically expanding the CSS framework to have the power to design full applications. For more polished visuals without the bloat, we added support for more CSS3 properties like text-shadow, box-shadow, and gradients. Adobe® Dreamweaver® CS5.5 is the industry-leading web authoring and editing software that provides both visual and code-level capabilities for creating standards-based websites and designs for the desktop, smartphones, tablets, and other devices. For more details on Adobe Dreamweaver CS5.5 check my post :
Adobe Dreamweaver New features .

Source : http://jquerymobile.com/
Download : http://jquerymobile.com/download/
Live Demo: http://jquerymobile.com/demos/1.0b1/