Creative Commons UI Design Pattern Library from Yahoo, (aka Yahoo Design Stencil Kit version 1.0) in Visio, PDF, PNG and more formats

Yahoo Design Pattern Library

Download a Stencil Kit

Yahoo Design Stencil Kit version 1.0 is available for OmniGraffle, Visio (XML), Adobe Illustrator (PDF and SVG), and Adobe Photoshop (PNG), and covers the following topics:

• Ad Units
• Calendars
• Carousels
• Charts and Tables
• UI Controls
• Form Element
• Grids
• Menus and Buttons
• Mobile - General
• Mobile - iPhone
• Navigation and Pagination
• OS Element
• Placeholder Text
• Screen Resolutions
• Tabs
• Windows and Containers

While not very Microsoft'y, this looks like a great UI design resource.

(via Chris Hopkins' Blog - UI Design Shapes)