Convenient optimization of images on the site

Today I came across a very convenient service: SmushIt.com , which is engaged in automatic optimization of web graphics on your site. There are three options for using this service:
- upload a set of images to their website through a browser;
- providing the service with a list of urls of images for optimization;
- and finally, you can install the plugin for Firefox and select images for optimization right in the browser.

Successful optimization!