I cook 9 lbs butts to an internal temp of 195* to 200*, which takes about 12 hours or more. I then wrap them in heavy duty foil and rest them in a cooler of similar size for 2 hours. My cooking temps are around 225* to 250* throughout the 12 hour period. Then unwrap, pull and enjoy!
Baby back ribs, same cooking temps, for about 2 to 3 hours. Then wrap them in foil and place them back on the cooker for another 1 to 2 hours. The foil wrap is what tenderizes and makes them fall off the bone if done too long or if thats how you like them. After foiling I place them back on the smoker to firm them back up a bit, around 45 minuntes to an hour. Then finish with your favorite glaze or sauce for around a half hour.
Take Kevin's advice and check out the cooking topics, they are a great starting area. You will find out that we all tweak things just a little different and our methods vary from one person to the other.