For those that like to read in Portuguese (and specially in European Portuguese) i have the wonderful news that the biggest editorial group in Portugal (
Porto Editora) just started selling ebooks in its virtual store!
http://www.wook.pt
The format chosen is ePub. I am very glad that i am able now to buy and read Portuguese books in non public domain. Yay!!
For those interested in portuguese language books, there is also another ebookstore
http://www.mediabooks.com/.
For Books in Brazilian Portuguese i know of
Gato Sabido, but probably there are more bookstores. Any brazilian ebook reader interested in showing us some more sites? We portuguese would be infinitely grateful!