CLEAR recently released a version of their connection manager software for Mac users (before that release, Mac users of the CLEAR USB device were out of luck [unless they used the device in a router]), but that version was only for OS 10.5. When they announced that release they noted that they would be releasing another version for Snow Leopard in October, but October came and went with no further mention of a version for Snow Leopard.
Finally today, the Snow Leopard drivers have become available for download at http://www.clear.com/support/download! Snow Leopard CLEAR users, enjoy!
