Joshua Eichorn has posted an update on his blog today about a change to the PHP-powered WebThumb API service - the addition of "EasyThumb".
Like the rest of webthumb its still in beta but it makes adding thumbnails too a site much easier. Easythumb gives you a simple interface to WebThumb letting people with minimal PHP skills integrate WebThumb into there site.
He includes a basic example script to get you started with the new feature as well as a bare-bones code example for the same kind of thing.