Keynotopia’s Mockup Bundle is available for free download, only catch you have to tweet the page. The Keynotopia Mockup templates include Android, BlackBerry, Facebook, iPad, iPhone, OSX, Web and Win 7 templates.
This library is great for turning sketches into wireframes and wirframes into high fidelity prototypes. Although these sketches are made for Apple’s Keynote (all files have Keynote’s .key extension), if your on Windows like me, instead on downloading the bundle you could copy the jpegs you want directly from page for later use in Fireworks (for clickable prototypes), Photoshop (for higher fidelity) or any other tool of your choice.
By Marc Niola – The UX Acrobat and
UX Strategist @ Digital Cunzai
Follow Marc on Twitter: @marc_niola