Morning Glory Pool is absolutely still open, and one of the great geyser attractions at Yellowstone.  Unfortunately, because of human damage and some vandalism over the years, the site has started to fade, so please make sure to view from a distance! 

Morning Glory Pool is in the upper geyser basin of the park, and is one of the most popular sites there so any ranger will be able to give you directions.

Below is a link to a short description and a small map of the area that you can use to navigate and make sure you're looking in the right place.  If you use a GPS device, the coordinates are: 44°28′30″N 110°50′37″W

about:  http://www.ohranger.com/yellowstone/sights-see

map: http://upload.wikimedia.org/wikipedia/commons/f/f0/NorthernSectionUpperGeyserBasinMorningGloryPool.JPG

Have a great trip!