If you ever need to mock up Web pages, applications, forms or other user interfaces in Illustrator or Photoshop, check this out: The Yahoo Developer Network features a set of free "Design Stencils." This collection of Web user interface widgets and doodads includes calendars, charts, tables, switches, knobs, sliders, form fields, check boxes, radio buttons, menus, navigation items, etc. downloadable as PDF (for Illustrator) or PNG (for Photoshop) files. The PDF files can be easily edited in Illustrator to include your desired text or colors. A great time saver for designers who create user interface mockups for specifications or user feedback.
(Thanks to the creativebits blog for this find!)