With EasyCapture all you have to do is navigate to a web page with an image on it you want. Click the bookmarklet I have provided for you and click the image and not only does EasyCreate host that image for you, it also creates a thumbnail for easy linking, and HTML you can use for that linking. Done!
I made EasyCapture as simple to use as possible. Just extract the files to a PHP enabled web directory and it should work. Zero configuration is required (but is available). View the INSTALL file, or the README file now.
Requirements: PHP 4.0+, and the GD Image library (included with PHP). FreeType is recommended, but not required.