The Koreader would be my first choice if I only read in English...
However, Koreader is still lack of vertical text and ruby support, which is used by lots of Chinese and Japanese books.
Also, the way Calibre handles book titles in Chinese and Japanese is a nightmare because it mixes pronunciations of two languages into one title without accents, making it hard as cross-word puzzle to guess the real title in one glance. The best analogy I can come up with is to read a English sentence cadenceless with all non-prepositions in French pronunciations....
Maybe I should look into advboot and see if it will suit my needs.
