Question: 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?

Answer: 
You could port [gameswf](http://tulrich.com/geekstuff/gameswf.html) to iPhone, it supports most SWF tags, it loads and renders in OpenGL. It's coded in C++ so it's easy to embed it into your iPhone application. Be warned that's it's usable but it has its limits.
You could use smokescreen to convert the flash to html5, and then use the stock HTML viewer found In interface builder. Just my 2 cents.