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Starting from scratch is always much harder than modifying already working code. There's nothing like seeing features in action before you try to use them.

plus-hangout-samples - It's sample code... for Google+ Hangout Apps

http://code.google.com/p/google-plus-hangout-samples/
https://developers.google.com/gadgets/docs/ui This document describes how to add different user interface elements to your gadget.

Creating a User Interface - Gadgets API - Google Code

I/O 2011

http://www.google.com/events/io/2011/sessions/html5-showcase-for-web-developers-the-wow-and-the-how.html Eric Bidelman, Arne Roomann-Kurrik We'll share the strengths and extents of HTML5, showing magnificent demos of bleeding-edge features in Google Chrome. Digging into high-fidelity graphics, performance, and system integration, we’ll break each demo down on the big screen to show how it was constructed.