hope it's ok to add random nits here.

thought it'd be easier than a new thread.
Seems ok so far.
Annotation selections are kind of a pain when you want to select the beginning or end of line. A margin would help. Maybe some zoom bubble like iBooks too since it's hard to know the exact placement.
Annotations would be nice if when you dragged it first selected the word. The boundaries end up being wherever my finger is and it's hard to get it exactly to the beginning or end of word. Who really wants to select a select a character?
Foreign language author and titles. Like 'À rebours' shows up as 'A€ rebours'. For that book the author shows up as 'HUYSMANS' though the PDF metadata is 'Joris-Karl Huysmans'. Forgot if I changed it and the deleted and reimported the PDF. Even if I did, should be ok.
No-justification would be nice
If you're at a book, press home, pressing return could go back to the book.
Reader desktop could be better. The Nook desktop is not too bad.