I definitely love the drawing tools in Flash. They are a great compromise between the freedom of raster drawing tools and the resolution advantages of vector graphics. For example, there's a fill bucket; you can't do that in Illustrator. Paths combine when they cross instead of staying as independent vectors, but you can still select and separate them if you want. etc.
I'm finished up an iPhone game right now, and the way I did all the graphics was to draw them in Flash, export to PNG, and then sometimes touch them up in Photoshop.
I suppose this isn't a definitive answer to your question, but that's my 2 cents.