Editorial disclaimer here - I have my own Spry/CF framework (cfspry), so I fully admit I came here looking for good ideas to improve my own code!
This review will be a bit short as I lost my original review. Andrew covered how you could move a static HTML page that generated Spry widgets to a completely dynamic one. The first iteration simply replaced hard coded data with data returned from a CFC. He ended up with a completely custom tag based solution.
His framework includes support for both widgets as well as Spry form validation (which is something I haven't yet added to my own custom tags).
I couldn't find a proper URL for his code, but this blog entry has a download: