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[...] we'd like to work with people who are more expert in creating stencils or library items for those other apps to figure out how to adapt them more usefully.
Speaking of other apps, some of my colleagues used PowerPoint to quickly mock a UI up. It’s quick, dirty, and it can be opened by client’s computer. The PNG widgets are useful in this regard, but, due to screen resolution, they need to be resized down every single time the image is imported.
To work around this, I created some widgets using PowerPoint’s drawing tool. It’s not the most fluid to draw with, but the end products are scalable, does the job well and can be skinned to look and feel like Yahoo’s pattern collection easily. I’d be delighted to work with you in adapting the design stencil kit into PPT.