This is how I introduced a queen to my observation hive. I placed a top cover to a finch bird bath over the half open sliding door of the hive and placed the queen in a queen catcher inside the cover late in the afternoon yesterday. I released the queen this morning and she is now in the hive. The bees appear much quieter now since they have a queen.
(http://img124.imageshack.us/img124/2536/img0527te1.th.jpg) (http://img124.imageshack.us/my.php?image=img0527te1.jpg)