These two buttons on the right (->) refer to my flagship product BetterZip. (Just in case you wonder.) The BetterZip Quick Look Generator on the other hand is
free and can be downloaded
here.
Don't you wish Leopard's Quick Look would let you inspect the contents of compressed archives? Well, I do, so I took a little code from BetterZip, a template from Apple's Xcode, added a little code here and there, and after simmering this soup for three days the BetterZip Quick Look Generator is ready for a public tasting. Hot!
The currently supported archive formats are: ZIP, TAR, GZip, BZip2, ARJ, LZH, ISO, CHM, CAB, CPIO, RAR, 7-Zip, DEB, RPM, StuffIt's SIT, DiskDoubler, BinHex, and MacBinary.
Download it here, unpack, and after carefully studying the License Agreement for the next two weeks, copy the BetterZipQL.qlgenerator bundle to your /Library/QuickLook folder (if you want to install it for all users on your Mac) or to the ~/Library/QuickLook folder, this is the Library/QuickLook folder inside your user folder. You may need to create the QuickLook folder inside ~/Library first.
The Quick Look framework will need a little time before it realizes that a new generator has been added. If you are impatient and not afraid of using the terminal, you can execute this command to make the Quick Look framework reset immediately: qlmanage -r
Last and best of it all: It's free!