I am very interested in building wireframes with Catalyst, but for now I use InDesign. One of the biggest concerns I have in moving to Catalyst is not being able to quickly and easily print out each wireframe screen. For meetings, I export files to a PDF and provide printouts for clients to follow along and take their own notes. In Catalyst, I would have to open the prototype in a browser and take screen captures of each interaction or stage. This would be very time consuming for the complex types of web applications I design. Plus, by gathering screens manually, I might forget to capture improtant interactions. It seems to me that having the ability to generate a PDF from Catalyst would be a good way to resolve this issue.