Is it possible to run custom apps or display long text on an ipod nano or a device that's similar to it?
I'll assume that by long text, you mean syncing notes or other text to be read on the iPod. The current generation iPod Nano doesn't contain a notes application, nor does it support apps. There was some news a while back that someone managed to do some hacking on it, but as of now, I haven't heard anything. The iPod Touch would do better for notes and apps than the iPod Nano.