So it is done. My first English eBook ("Levels and Curves with GIMP") can already be found in Amazon, both for purchasing and for lending (so you can borrow it, you do not need tu buy it...).
(it is the English version of the original book in Spanish, that you can also check here).
You can find the file for the new eBook here.
And the paperback version can be found here.
If you get any of those, I would like to have your opinion on them...