Is Assembly Language worth learning?

I've heard that learning assembly language is a good way to become a better computer programmer. Is this true? Is it worth the effort? Does anybody have any suggestions on this subject?

>>50
True true true.  Pretty much anything you can do in asm you can do in C. 

However I wrote most of that (>>49) assuming that there IS no OS environment available.  Which is something you CAN'T do in C, which is make a program that functions without an OS.