Portable RIAs

James Ward has a great tutorial on how to embed a RIA in a PDF. The basic idea is to render a PDF on the server side that embeds a Flex application. The basic steps:

1. Create the back-end data source for the application
2. Create the basic Flex front-end application
3. Create a back-end PDF generation service
4. Create a PDF with form fields that will be used to store the data
5. Modify the Flex application to read data from the PDF
6. Add a way for the user to generate a PDF from the Flex application
7. Merge the final Flex application into the PDF template

 Check it out here Portable RIAs.