I posted these to Twitter, but I'll put them here too for posterity. Here are screenshots of my newly compiled version of Quake 3 running on the iPhone 3GS on max graphics settings. I made my own icon for it as I didn't like the original. Do note that the frame rate generally dips by 10fps when I press the screenshot buttons, and it runs really smooth on device! No special hacks used when building; I did turn on auto vectorization and NEON in the compiler settings.