Patrick let me know that BlackBerry Insight is running a promotion offering Ziplorer for FREE for 24 hours only. Ziplorer is a file zip and unzip client for BlackBerry based on gZip & pkZip/kZip formats (The standard ZIP formats). It also acts as a sort of file manager.
You can find the free download at the bottom of this page on BlackBerry Insight. Sadly it is desktop manager install only but that means you can keep your copy!
Kudos to BlackBerry Insight for the free download!