Good question. If you know a little bit about the system, catalog, and DMV's on SQL server the answer was easy.

Looking at the answers given, I think several people don't know the differance between the Catalog View's and DMV's.

The Following are SQL Databases and Files Catalog Views:

sys.database_mirroring

sys.backup_devices

sys.database_files

sys.databases

sys.database_recovery_status

sys.masterfile

There is a full listing of Catalog Views here:

http://msdn.microsoft.com/en-us/library/ms174365.aspx

Dynamic Management Views here:

http://msdn.microsoft.com/en-us/library/ms188754.aspx

Full listing of system tables by topic is here:

http://msdn.microsoft.com/en-us/library/ms179932.aspx

Have fun! 😎