Design Stencil Kits from Yahoo

Yahoo has very useful design stencil kits for Visio and in PDF and PNG format to create mockups and wireframes of all kinds.

Freely available here: http://developer.yahoo.com/ypatterns/wireframes/

The components they have include:

• Ad Units
• Calendars
• Carousels
• Charts and Tables
• UI Controls
• Form Elements

• Grids
• Menus and Buttons
• Mobile - General
• Mobile - iPhone
• Navigation and Pagination
• OS Elements

• Placeholder Text
• Screen Resolutions
• Tabs
• Windows and Containers