Pay attention when you buy the cast iron Dutch oven. Some have lids with little pointy things hanging down inside (stalagt-somethings ?) so that moisture is evenly distributed when you are braising, baking, etc. Another bit from Alton Brown, of course. A fun place for looking is
"Kathy Applebaum" >wrote, in part (I have to admit I have been eyeing a cast iron Dutch oven, though...)