Hey guys, got a downloader that will work for Macs as it uses php, not java (flash) to download. It's a web based app, you don't need to download it so it's completely safe. You can use it to browse, watch, and download the videos you are watching. http://playbookyoutubedownloader.com When you select a video simply click download below it and select one of the Mp4 options. It's already formatted for viewing on any mac as well as iPhone and iPad as well as iPod.