Do you have a feeling that even with such good compressing software as WinZip and WinRAR there is still room for perfection? You are probably right. Open Source software once again proved its superiority over commercial software with 7-Zip.
As mentioned above it's open source and thereby FREE !!
For a review visit http://tinyurl.com/3y2q89
For download visit http://www.7-zip.org/