I do between 5 and 6 per week. I do a split though, I love to do cardio in the AM and my weights in the PM. Cardio gives me that extra boost to start my day, I do not feel strong in the morning though, which is why I lift in the evenings. I have been working out like this forever.
Lately, I pick on of Cathe's, Amy Bento's, Tony Horton or Kimberley Spreen's workouts, or I just hop on the elliptical for 45 minutes in the AM.
PM weight workouts are usually Cathe, but I add P90X workouts as well. I also add another "butt" busting workout on a day I work my lower body. My current fave is "Squeeze". But Cathe's Lower Body Pyramid has a great floorwork booty workout as well.