InDesign CS4 can export pages to XFL format. These XFL files can be opened in Adobe Flash CS4 Professional for further editing and animation before being published as Flash (SWF) files for use on the Web. When the XFL file is opened in Flash, the text is editable, but InDesign paragraphs are broken into individual one-line blocks of text. A really handy tool for recombining multiple text blocks into one is the Combine Textfields extension for Flash from Ajar Productions.
Yesterday Ajar Productions released a similar tool for Adobe Illustrator, called the Merge Text Extension. This script works with Illustrator CS-CS4. It could be particularly handy when you need to edit a PDF that has been opened in Illustrator.