I have been using the pentatonic scale pattern used in the guitar tricks "scales" page and notice that it is one basic pattern with different extensions that I usually pick out by ear.
I notice that on this page (listed below), however, that the pattern is different as you go up and down the fretboard. Why is it different? http://www.guitar.ch/home/scales/min_pen_dots.html
This is a great site. Just the pentatonic pattern alone has taken me to a new level of playing. I've been playing on and off for 2 1/2 years and I love it!