>Showtime already renewed the show for a 5th season which will have 12 episodes. May be until September 2010.
Will Rita be in season 5 of Dexter?
Clearly Rita is now dead and will only appear in flashbacks – Knew it had happened the second Dexter tried to call her 😉
As for the books, there are 4, i own and have read them and i can tell you that after the 1st book they bare practically NO similarity to the tv show. For a start they focus on a more supernatural cause for Dexter’s ‘abnormalities’. There are other differences which i cannot divulge without outright giving away plot but i can tell you that the only real similarities left tend to be the characters themselves and their relationships to one another.