For this post, I’ve collected 18 great examples of sketched UI wireframes and mockups. A lot of these look so good that you may be inspired to start your next project with a sketch.
NationWide / NASCAR
5 Years of Firefox
Links
GEOINT2009 (Microsite)
Coastal Capital Partners
New Local
Vimeo Profile Page Idea
Layout for BPgraphics
Vimeo Clip Page Top Nav
Cartoonity.com UI Sketch
CommLogix Wireframe
Early Ember Sketches
Wirethumbs
More Ember Sketches
iPad App Sketch
Web Layout Sketches
Librespeak interface sketch
Original Twitter Concept
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Here's some other articles that you will definitely find useful.
11 UI Kits for iPhone and iPad Development
10 Free Printable Web Design Wireframing Templates
10 Excellent Tools for Creating Web Design Wireframes
A UI Design and Prototyping Treasure Chest
The Four Key Components of a Great Web Design