TopOCR's Text To Speech interface can allow you to convert the OCR generated text output into an MP3 file that you can save directly in your Portable Music Player!
After you finished OCR of an image and cleaned-up the text in the editor, just press the "TextToSpeech" menu button in the Text Window. This will bring up the TextToSpeech Dialog. Click on the "Save to .wav" button and save the .wav file. Then click on the MP3 Encode button and open the .wav file you just created and then encode it as an MP3 file. Congratulations, you have just converted your Portable Music Player into an eBook reader!