A handy little tool for resizing images automatically. Caches images to limit processor speed. Very nice for when your users might be uploading their own images.
Requires the gdLibrary be installed on your server. Here’s a handy script to check if it is.
Basic implementation looks like this:
<img src="/scripts/timthumb.php?src=/images/whatever.jpg&h=150&w=150&zc=1" alt="">
Here’s a nice article on implementing it with a WordPress theme.