Carbonite, a cloud based (online) backup solution that backs up all the files on your PC over the internet, has released a mobile application for the BlackBerry that provides users access to all their backed up files via their device.
Carbonite is actually a pretty cool backup service and costs less than $5.00 per month. They offer a 15-day free trial and the BlackBerry client during which you can test out the Carbonite BlackBerry application.