Cross-browser and cross-platform samples:

Interactive Tree
(GUI Style)

Hot Keys
Keyboard Shortcuts

Pop-up Window Designer
Utility

SVG Editor
(GUI Style App)

Slider Selector
(Drag'N'Drop Widget)

Form Validation
Widget

Log Setting
Widget

Multi Search
Widget

Process Animation
Demo

Guitar Chords Generator
Widget (in Russian)

Interactive Map
Demo

Task Manager
Drag'N'Drop, Ajax, DB App

Internet Explorer 5.0 and higher samples:

Transaction Console
Demo App

Agent Inventory
Data Binding

Module Builder
Drag'N'Drop App

Style Editor
Widget

Color Match
Utility

Table Grid
Widget

App Modeler
Utility

Mail Client
Demo