Here is the Wiki, the encyclopedia of node-webkit. I know most of you just don't read documentations, but please at least skim the content, you could find answers to most of your questions here.

Basic:

• Features list
• How to run apps
• How to package and distribute your apps
• Manifest format - the format of package.json
• How to use 3rd party node.js modules in node-webkit
• Troubleshooting

API:

• Node.js Manual & Documentation
• Native UI API Manual - node-webkit API for native UI controls
• Changes related to Node - Things added/changed to Node API after bring in DOM

Advanced:

• The Kiosk mode
• File dialogs
• Support mp3 and H264 in video and audio tag
• Build native modules with nw-gyp
• Command line arguments of 'nw' executable
• Third party browser plugins
• WebGL support on Windows
• About node.js server side script in node-webkit - wonder how to use express stuff in node-webkit?
• Get version of node-webkit in app
• What if Node's require() conflicts with the same name in your code (e.g. RequireJS) ?

HTML5 Features:

• Play with window
• Dragging files into page
• Save persistent data in app
• Control camera and microphone with getUserMedia API
• Use datalist for auto completion

Debugging:

• Debugging with devtools
• Debugging with Sublime Text 2
• The nw protocol

Traps:

• Console and timers
• Transfer objects between window and node

• Building node-webkit
• How node.js is integrated with Chromium
• Downloads of old versions
• List of apps and companies using node-webkit