How many can you handle at once? Everything I have seen in pictures shows anywhere from two to four, is that a normal amount used?

I just use two. There is a use for four, but it gets a little complicated for my tastes-I simply cannot keep up with that much all at once. I guess I need some lessons in multitasking!

I've got a friend who uses 3 or 4 regularly. I think he's buts but brilliant at the same time for being able to keep them straight. I use no more than two myself. I'm a less-is-more kind of person so I'm not really intersted in using more.