YemuZip: Free zip utility for Mac creates Windows friendly Zip files
But wait, doesn't the Finder have its own built-in Archive (zip) function?
Yes, it does -- but oftentimes, when you create a zip file on a Mac and unzip the file on a PC, you'll get a lot of gobbledy-gook along with your unzipped files. That's because the PC doesn't know how to read the Mac-specific metadata. YemuZip will zip your files in either a Mac or a PC format so you can avoid the unnecessary information.
The application itself couldn't be easier to use. Simply drag and drop the files you wish to compress onto the YemuZip interface, choose whether you want a PC or Mac specific zip format, and away it goes, merrily compressing.
YemuZip is free for personal use, and requires Mac OS X 10.4 or later.
[via Cool OSX Apps]