Zipbit - Skinnable Easy-to-use archiver, with many useful features.
ZipNow - Easily zip/unzip files with the push of a button!
ZipSplitter - ZipSplitter can zip and split large file on several smaller self-restoring parts
PowerZip - PowerZip: Zip, unzip, split or password-protect (encrypt) files quickly easily
BigSpeed Zipper - Internet-enabled zip compression utility with many unique features
CompreXX - Archives Behave Like Folders in Explorer! Create RAR, SIT, ACE, 7ZIP!
ACDZip - ACDZip is the digital imaging zip software that makes opening zip files easy.
CCZip - CCZip is a fast, efficient ZIP/unZIP utility for Windows 95/98/ME/NT/2000/XP
bxAutoZip for Outlook - A dedicated Outlook Add-In which automatically compresses any attachments.
CoffeeCup Free Zip Wizard - This is a great compression tool with built in Email, Zip, and FTP functions.