After finding the info for the post below, I found a bunch of other things on alt-php-faq.org. like:
encrypting using pgp class and php here too
making thumbnails with php
using php to POST to another url without forms and hidden variables (this script will come in handy if/when I take a shot at fixing some of the annoying parts of the "subscribe to comments" script)
…there's just a BUNCH of stuff there…