At Norris Geyser there are several different geyser areas. Steamboat Geyser is probably the most popular because it is the tallest geyser. But, I went to the Porcelin Basin, which was very pretty and had some steam pockets, but nothing went off. I didn't feel so bad though because nothing went off at Steamboat Geyser either. This are though represents a more baren type of geyser area, some others are more woodsey. But it's the type of place you could hang out at all day and nothing happens, which would make me sad.
Old Faithful is not the most regular or the largest geyser, but it is the most regular large geyser. At Old Faithful there are two large lodges, one with food and shops, the other as more of a visitors center. Old Faithful goes off every 35 to 120 minutes, when I was there it was on a 45ish minutes cycle. She went off for about 2-3 minutes when we were there, long enough for me to watch a bit and take over 150 pictures. When you enter Yellowstone the guards should be able to tell you when she's scheculed to go off, you could probably also find out from just about any ranger at the park too.
