Just some projects that I've worked on. If they're usefull, you can download them.

• A Javascript terminal client: a DIV with keypress and keydown event handlers that communicate with a PHP file on the server with AJAX and JSON.
  
• Syntax Highlighter: a fast syntax highlighter that can be expanded with many languages.
  
• Richtext Editor: a small richtext editor with some nice features, like the option to add CSS classes to rthe toolbar (instead of using styles directly).