If you spot any particularly interesting or useful articles or sites related to PHP (or other pertinent IT topics), please post them here.
Today I came upon a short article called "Portable PHP Code
". It's a pretty short article, but makes some good recommendations that you should follow even if you don't care about portability. Among the tips are why you should have register_globals off, why you should always use long tags (<?php instead of just <?), and why you should never hard-code database and table names. Check it out.