is a simple Automator app that allows you to easily compress PNG images inside your iWeb site into JPG files, but it
maintains the same file name so it doesn't break any of your links or images. Simply drag and drop the site folder that
iWeb creates (be it in your iDisk or an exported directory you specified) onto iWeb Optimizer and let it work its magic.
The handy little utility will also parse all your subdirectories, making sure no PNG is safe from a little JPG
iWeb Optimizer is free and available from Automator World.