Zipeg

zipeg.png Another of the many many compression utilities, Zipeg is available for both MacOSX and Windows.
This freeware compression utility is interesting because of the preview functionality. You can basically look inside a compressed archive and actually explore it without extraction. This includes iso files for CD/DVDs which makes it very interesting. This is one of those utilities that you really should keep in your back pocket in case you need it and the trustworthy ole’ WinZip or whatever else you are using just can’t open the compressed file.