Normally, when it comes to decompressing image files, you don't really know what you are going to get until it's done. However, with Zipeg, you can see exactly what's inside a compressed file before you even start the compression process. Zipeg displays images in thumbnail format so there's no need for you to wait ages for the decompression process is finished to know what you are going to get. Best of all, it's totally free.
Of course, it unzips non-image files also and can do everything that WinZip and WinRAR can. It supports a huge variety of archive formats including ZIP, RAR, ARJ, LHA/LZH, 7z, TAR, GZ and WAR and EAR. It supports dragging and dropping so you can extract or unzip items simply by dragging them into the interface which is well presented, elegant and simple to use. If you've got a huge batch of files to unzip, you can leave it decompressing in the background whilst you work. The only downside is that sometimes, the thumbnail previews take a few moments to appear although it's still much quicker than unzipping an archive to see whats inside.