While most Linux veterans would tell you the command line is all you need to archive a bunch of files, we're fond of PeaZip for its feature-filled, easy-to-use (if sometimes glitchy) interface.
GnomeDesktop.org looks at PeaZip. "PeaZip is a cross platform archiver, released under LGPL for Linux and Windows, developed using Lazarus/FreePascal. Basically it acts as frontend for console ...