The book recently released by Apress, entitled 'The Definitive Guide to NetBeans Platform' was a community translation. What that means is that the original book was written in German (by someone from the NetBeans Platform community, i.e., an independent person, Heiko Boeck, unrelated to Sun Microsystems) and that the NetBeans Platform community translated that book (unpaid) to English. (That happened in the space of one very intense month.) The book was released at JavaOne and was very popular there.
Now, however, other language communities have also begun translating it. Below are the project pages where each of the translation projects is being managed (in each case by one of the members of the translation group):
Have a look at their progress, they're all in various stages but clearly making some headway. Are other language communities interested in working on a translation of the book too? How about Chinese for example? (The existing NetBeans Platform book in Chinese is slightly out of date, though still very useful and recommended.) And how about the Brazilian-Portuguese community? Volunteers are more than welcome!