Hi everyone,
This is a link to an Arabic Reader with the stories in Qasas-Un-Nabiyeen
http://www.arabicreader.net/arabic_reader.html#read
You can click on any individual words to see what they mean. I think it's really good to read to children because it has pretty simple sentences.
It's also amazing for people, like me, that are learning to speak Arabic.
I haven't read through all of it yet, I've only read the story of Ibrahim ('aleyhi salam) but i'm sure all ages would find enjoyment in reading it.
It is available on amazon (http://www.amazon.co.uk/Stories-Prophets-Sayyed-Hasan-Nadwi/dp/1872531091/ref=sr_1_2?ie=UTF8&qid=1347009501&sr=8-2) but its the english translation
I've never read the english translation so I can't really comment on it.