http://mac.appstorm.net/ By far one of the most exciting is the Youtube downloader extension that lets you save a local copy of the content you are watching on Youtube. Quite a bit of fun. It’s on that list at the bottom of the page. note: many people have reported problems with Safari 5 so you may want to wait until version 5.1 is available and sorts out some of the issues. ]]>
Download Youtube videos via Safari Extension