Hi Damjan. That's a very good idea. It does not exist yet, but it would be nice to offer this. Not owning an e-book reader myself, I am wondering what format would be best? Would PDF be sufficient?

PDF will be great because most of people have acrobar reader on computers.
If need any help for making it I will help. Have little time but I will give my best :)

Oh, I see. I thought you asked for a file to put on a physical ebook reader like the Kindle. But since the things would have to be tried out on the computer anyhow, I guess a PDF would be more than enough.

I think that is not so complicated to convert book to kindle or ipad if you have it prepared in PDF. If you make good prepration it can be printed too.