anybody writing networking-protocol code, embedded systems etc. cannot help but use them. to me it seems that the entire article is pretty narrowly focussed on folks doing web development exclusively.

also, fwiw, i think, couroutines are to state-machines as subroutines are to goto. the best tutorial on teh web on this is, imho, by dave-beazley here: http://www.dabeaz.com/coroutines/index.html