Looking For Rapid Prototyping Tools

I'm looking for advice/recommendations on rapid prototyping tools for  
mocking up web interfaces that I could use in a usability test.  
Ideally, this tool would allow me to lay out my design and configure  
interactive elements without coding, and then export to HTML for  
testing.

I've looked at DENIM but it seems to be too simplistic to achieve  
anything beyond a 'cocktail napkin sketch'. My brief experience with  
Flash leads me to believe that it might require too much effort since  
my goal is not to build the final app in Flash. Visio (which I  
already have) seems to provide easy manipulation of elements and easy  
HTML export, but the interactivity is limited to linked elements. It  
would be nice to allow a user to type something into a text box or  
open a select menu even if that data is not actually processed by the  
mockup. I've found some other tools in a Google search, but none jump  
out as a can't miss. Any ideas?

Thanks

Jeff
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