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It's a debugger for web pages, like FireBug (for FireFox) and Web Inspector (for WebKit-based browsers), except it's designed to work remotely, and in particular, to allow you debug web pages on a mobile device such as a phone.
PhoneGap | Cross platform mobile framework
PhoneGap is an open source development tool for building fast, easy mobile apps with JavaScript.
If you’re a web developer who wants to build mobile applications in HTML and JavaScript while still taking advantage of the core features in the iPhone, Android, Palm, Symbian and Blackberry SDKs, PhoneGap is for you.
jQTouch — jQuery plugin for mobile web development
"A jQuery plugin for mobile web development on the iPhone, Android, Palm Pre, and other forward-thinking devices. "