zip, tar, ace and all the other archivers are lossless 7zip is a freeware utility with a high compression rate that compares well to others on the market.. except it's freeware and while windows users have had it for a while, mac users now too have access to the program: windows : http://www.7-zip.org/ mac available here: http://www.macupdate.com/info.php/id/21697 or this: http://mac.softpedia.com/get/Compression-Tools/EZ-7z.shtml and a comparison: http://en.wikipedia.org/wiki/Comparison_of_file_archivers k
