At MIX 09 this week, Microsoft released the prototyping tool SketchFlow. SketchFlow allows the designer, to "sketch" up a simple prototype, using a combination of flow diagrams and hand drawn pictures or controls that looks hand drawn.
By using Silverlight, SketchFlow can create a prototype that easily can be shared with the client using the Web, and with annotating tools, the client can comment on different aspects of the prototype.
In that the prototype is a Silvelight application, it is also possible to use animations, within the prototype, to better illustrate different transition within the proposed application. There is also the added benefit of using this tool when developing Silverlight and WPF applications, it that the prototype can easily be used as the base for the actual implementation (check out the MIX 09 day 1 keynote).
Not knowing existing prototyping tools, I can't say whether or not this product is all that different from existing prototyping tools. The SketchFlow will be able for preview later this yaer.
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