Say I have some 2D artwork in Flash CS4 format .FLAs, and I'd like to put it into an iPhone game that uses OpenGL ES, keeping it in vector format. An OpenGL-ready format could just be a list of vertex positions and colors for a triangle strip.
Is there a converter available that can do that easily?
I would recommend converting the swfs to .svg format, Either in Illustrator, or with this online tool. I actually used a small java console app to automate this part for what I had to do recently, it worked pretty well.
Once that's done, you can use Qt to do the rendering bit for you as commented on here.