Originally Posted by mrtolles
No, you can't hide folders on the Blackberry 8900. You can however, connect the blackberry to a PC in Mass Storage Mode and hide folders that way.
Actually this works very well.
Hide the folder using Windows Explorer (or whatever) and all of the files listed underneath that folder will be "hidden" as well, whether or not their properties are set to "Hidden".
You can access them from the "Explore" option at the Media Selection screen and all options are still available from there.