What is considered harmful, according to the web?

Typing 'considered harmful' into Google brings up an interesting selection of obviously geek articles :-) Now I'm no computer scientist (actually a mathematician turned meteorologist who happens to teach computing) but maybe I should be -- the top article in that search (as of today at 4.30pm BST) is a link to an article by the famous mathematician/computer scientist Edsger Dijkstra (I recognised the surname; now I know a little more!) which appeals to me. It presents a clear case for ditching the "GO TO" statement in computer programs. I'd always been told it was a bad idea in FORTRAN (sorry, meteorology has a long history with that so-called dead language!) and now I know why ... so, if you're learning to program and curse procedures, functions and methods, read the article and try to understand what it's on about!