The Blackberry mobile version has just entered pre-Alpha status. Most of the API functionality is complete and now it is just a case of building the UI. It should be ready for a mid May release.
This will mean that soon Blackberry owners will be able to view/manage/access their files directly from their device for any of the following clouds:
Amazon S3, Google Docs, RackSpace Cloud Files, Microsoft SkyDrive, Microsoft Live Mesh, Box.net, MobileMe, FTP, Gmail, and WebDav clouds.
You can view a short video of this here.