jam*wil, beware, this is an old tutorial that assumes Register Globals is on... Not only is it not safe coding, but it also misleads newbies a lot. I would say at least twice a week, a newbie comes on these boards, referring to that tutorial, asking why the POST or GET doesn't work... I am sure you know better, but if you ever recommend that tut to a newb, you may want to find a different tut (one more up-to-date) to refer them to.
Other than that, I believe it's a decent tutorial. You can tell a lot of htought and effort went into it way back when it was written.