Yahoo Widget是如制作的?

應該係 JavaScript and XML
你可以 download 佢地 Develop kit 睇睇

V E R S I O N 4 . 0

We built a special edition of the Yahoo! Widgets application just for you.

Get everything you need in a single download
• Yahoo! Widgets 4.0 for Windows
• Yahoo! Widgets Reference Manual v4.0 (PDF)
• Widget Creation Script for Photoshop CS v2.0
• Widget Converter Tool v1.1
• Widget Creation Tutorial v1.1

http://widgets.yahoo.com/workshop/