I've been reading the pickaxe book and I think I kind of understand them, but I 
really need a concise explanation of the point of them and the power of them to 
put me over the top.

Any references to more info on this very much appreciated!

I think one of the points of yield is to allow user defined classes to have 
easily defined iterators?

 
Thanks in advance and have a good day!
Christopher
 
Christopher J. Meisenzahl CPS, CSTE
Senior Software Testing Consultant
Spherion
christopher.j.meisenzahl / citicorp.com