For those of you who like tinkering with your websites, the following site has a ridiculous amount of excellent resources:

hotscripts.com

Almost all of the major advancements we have done with our site, and a few other ones we have floating around, have come from free stuff on this site. I primarily stick to the PHP section, though I am sure there is equally good material in the other sections.

Added: Here is the direct link to the PHP section...

PHP scripts/programs

If anyone needs any pointers I'm happy to help out if I am able.