Is anyone aware of a wireframing kit for Illustrator (or any vector based template) that encompasses GUI elements from Mac OSX Lion or Mountain Lion?
There's also a paid one here. It says it's available for Illustrator, Fireworks, Visio, OmniGraffle, Axure, Keynote and PowerPoint, and the Illlustrator single license is apparently something like $24.
Does it have to be vector? Here is a raster one for Photoshop.
There is a Sketch vector UI kit http://yosemiteui.com
You can export it to PDF and import in Illustrator.