Generally, natural harmonics are done at the 5th, 7th and 12th frets. Pinch harmonics are a trademark of Zakk Wylde, and can be performed much easier with the advent of distortion. Artificial harmonics aren't too difficult to do, but they are a hassle to explain, but it's pretty much covered...
There are only two important things in life - There's music and theres girls, not necessarily in that order....
The Ace's Guitar Tricks
The Ace's Guitar Tricks