Basecamp: Next Shows Off Rapid UI Prototyping Process

37Signals have long been proponents of doing design prototyping in HTML, and this video is a great example of how that is more effective than a traditional photoshop method. Their lead designer, Ryan Singer, has shown this technique off nicely at various conferences and also captured it in two videos for Peepcode: UX Sketching and UX/UI Prototype

This isn’t an easy process to implement, and working in HTML/CSS as your initial mockup takes a bit of mental gymnastics and abstraction to get it right, but it can be a powerful tool if done correctly.