• Troubleshooting Tape Drives in ntbackup
• How to Rebuild the Removable Storage Service Database
• Troubleshooting ntbackup
• Replacing Old Tapes
• Managed Mode Backup Script
• Ntbackup Script 1 - has useful code (that actually works!) on finding logical GUIDs

Links which might be useful (not tested):

• Scripting
• Using command line parameters with  (Microsoft KB article)
• Backing up Exchange 2000/2003 with (Petri)
• How to Use the Backup Wizard for Backup Jobs Windows 2000 - I found this because I was searching for a way to run an inventory. It turns out you do it from the Removable Storage section computer management.
• http://support.microsoft.com/kb/239892 - How to schedule unattended backups using a stand-alone tape library - has scripts and talks about unmanaged mode
• http://support.microsoft.com/kb/237310/ - How to manually edit ntbackup selection script files (.bks files)