WinZip is the original and most popular of all Windows ZIP file utilities. Wizard/Classic interfaces accommodate both first-time and experienced users. With WinZip you can quickly and easily compress and decompress files, folders, and entire folder trees to save storage space and reduce e-mail-transmission time, as well as encrypt and decrypt your sensitive documents. Features include tight integration with Windows Explorer, support for most Internet file formats, and one-click zipping and e-mail.
Editor's note: WinZip is now bundled with Google Toolbar and Google Desktop Search. Installation of these components is optional.