a well written and well thought out tutorial that could be applied to any language

I beg to disagree.

Thet tutorial that you claim as an example has several negative points that we in the Monastery usually consider bad practice and advise against:

• Mixing the program flow with the user interface. The code given is a horrible mix of PHP and HTML, something that a good programmer should avoid like the plague.
• Using language variables embedded in SQL query. The infamous "SQL injection" comes from people accustomed to this practice
• Using a system call without checking its result.

The works in our Tutorials page have passed the scrutiny of the Monastery, which is quick in pointing out problems and suggesting corrections. Had your exemplar tutorial been proposed here, it would have been torn to pieces in a couple of minutes.

Not to discourage you, but please come up with some better examples. We Perl Monks are, paraphrasing Oscar Wilde, people of simple tastes, we are always satisfied with the best. {grin}

BTW, our Tutorials already include links to (carefully chosen) external works.