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Zeldman Presents
Gabe Zentall has published a library of user interface templates in Adobe Illustrator (also available as PDF), which provides UI elements for use in prototype design. It covers Windows, OS X, and Palm. The templates are excellent excellent for creating high-fidelity wireframes or prototypes. Template sets are separated on different layers in the Illustrator file and all are of course, completely editable. This is perfect for Illustrator wireframers. I'm thinking that this would be a nice OmniGraffle pallette as well.
[Thanks, Column Two and Reloade]